Look what I found on yahoo.com:

Bitcoin EUR (BTC-EUR)

Time Period: Sep 17, 2014 – Jul 17, 2023

Show: Historical Prices

Frequency: Monthly

Currency in EUR

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Date	Open	High	Low	Close*
Jul 17, 2023	26,929.26	27,021.27	26,500.54	26,576.47
Jul 01, 2023	28,011.22	28,956.97	26,681.35	26,979.12
Jun 01, 2023	25,812.10	28,834.90	22,886.79	28,014.90
May 01, 2023	26,282.18	26,917.11	23,848.01	25,813.80
Apr 01, 2023	25,707.18	28,022.13	24,484.81	26,284.86
Mar 01, 2023	21,888.72	26,917.97	18,531.49	25,708.38
Feb 01, 2023	21,304.23	23,541.44	20,022.11	21,885.34
Jan 01, 2023	15,427.14	22,008.57	15,402.27	21,305.56
Dec 01, 2022	16,471.00	17,154.39	15,346.85	15,426.75
Nov 01, 2022	20,731.51	21,482.27	15,234.93	16,471.54
Oct 01, 2022	19,823.61	21,062.04	18,991.76	20,732.40
Sep 01, 2022	19,974.53	22,291.38	18,436.15	19,824.31
Aug 01, 2022	22,855.56	24,529.92	19,573.50	19,973.79
Jul 01, 2022	18,915.45	24,028.84	18,186.57	22,855.74
Jun 01, 2022	29,616.86	29,788.95	16,871.79	18,881.34
May 01, 2022	35,768.54	37,683.83	25,197.89	29,616.63
Apr 01, 2022	41,138.78	42,981.43	35,609.54	35,770.07
Mar 01, 2022	38,517.14	43,792.06	34,336.88	41,124.80
Feb 01, 2022	34,269.20	39,776.27	30,687.86	38,516.01
Jan 01, 2022	40,717.38	42,097.43	29,323.49	34,270.42
Dec 01, 2021	50,227.37	52,107.59	37,893.53	40,712.72
Nov 01, 2021	53,061.87	59,496.15	47,323.10	50,313.39
Oct 01, 2021	37,858.23	57,457.26	37,424.38	53,060.58
Sep 01, 2021	39,881.12	44,487.54	33,926.78	37,835.90
Aug 01, 2021	34,937.93	43,068.28	31,643.25	39,937.78
Jul 01, 2021	29,550.96	35,590.08	24,936.05	35,077.27
Jun 01, 2021	30,487.38	34,060.75	24,278.27	29,555.05
May 01, 2021	48,017.50	48,969.01	25,122.69	30,519.31
Apr 01, 2021	50,247.15	54,238.39	38,988.30	48,047.05
Mar 01, 2021	37,350.48	51,604.29	37,313.16	50,240.56
Feb 01, 2021	27,316.28	48,134.50	26,701.19	37,332.50
Jan 01, 2021	23,735.42	34,261.72	23,363.98	27,316.10
Dec 01, 2020	16,447.03	23,781.85	14,539.37	23,741.74
Nov 01, 2020	11,801.33	16,459.79	11,373.82	16,440.38
Oct 01, 2020	9,208.83	12,013.03	8,894.07	11,801.33
Sep 01, 2020	9,783.76	10,126.69	8,388.91	9,199.65
Aug 01, 2020	9,612.67	10,413.77	9,346.39	9,785.02
Jul 01, 2020	8,140.98	9,680.95	7,959.78	9,613.43
Jun 01, 2020	8,512.43	9,164.19	7,994.82	8,133.87
May 01, 2020	7,924.76	9,224.35	7,652.44	8,510.14
Apr 01, 2020	5,838.08	8,689.92	5,677.55	7,911.76
Mar 01, 2020	7,798.25	8,161.13	3,672.95	5,839.28
Feb 01, 2020	8,423.86	9,616.43	7,724.58	7,798.03
Jan 01, 2020	6,412.61	8,657.20	6,187.71	8,427.62
Dec 01, 2019	6,871.95	6,978.24	5,884.81	6,411.46
Nov 01, 2019	8,240.55	8,541.18	6,002.07	6,870.14
Oct 01, 2019	7,614.51	9,044.62	6,689.85	8,245.56
Sep 01, 2019	8,746.50	9,879.59	7,154.35	7,609.14
Aug 01, 2019	9,102.56	10,960.33	8,503.28	8,746.57
Jul 01, 2019	9,503.08	11,672.98	8,166.90	9,109.95
Jun 01, 2019	7,659.70	12,135.60	6,696.89	9,520.88
May 01, 2019	4,771.00	8,089.80	4,767.23	7,660.29
Apr 01, 2019	3,657.87	5,035.36	3,650.34	4,771.26
Mar 01, 2019	3,388.58	3,828.88	3,293.71	3,657.87
Feb 01, 2019	3,023.15	3,713.91	2,990.34	3,389.31
Jan 01, 2019	3,260.42	3,591.64	2,973.74	3,020.30
Dec 01, 2018	3,555.65	3,807.38	2,822.04	3,256.93
Nov 01, 2018	5,584.01	5,769.18	3,160.73	3,549.30
Oct 01, 2018	5,703.89	6,023.19	5,380.28	5,583.19
Sep 01, 2018	6,073.64	6,381.29	5,319.00	5,708.81
Aug 01, 2018	6,647.59	6,647.02	5,234.09	6,067.40
Jul 01, 2018	5,488.04	7,210.71	5,261.89	6,657.35
Jun 01, 2018	6,416.89	6,650.85	4,999.06	5,481.47
May 01, 2018	7,659.14	8,332.92	6,102.13	6,411.30
Apr 01, 2018	5,683.84	7,972.28	5,297.35	7,650.10
Mar 01, 2018	8,519.28	9,495.46	5,426.15	5,659.87
Feb 01, 2018	8,245.25	9,693.99	4,879.60	8,529.86
Jan 01, 2018	11,758.21	14,725.97	7,688.52	8,232.20
Dec 01, 2017	8,571.69	17,094.11	8,138.56	11,795.03
Nov 01, 2017	5,528.26	9,720.15	4,732.07	8,601.11
Oct 01, 2017	3,675.12	5,554.02	3,536.65	5,551.80
Sep 01, 2017	3,948.40	4,195.87	2,464.97	3,673.14
Aug 01, 2017	2,429.60	3,981.55	2,249.70	3,949.77
Jul 01, 2017	2,182.47	2,558.24	1,607.25	2,433.02
Jun 01, 2017	2,036.06	2,677.45	1,987.93	2,172.17
May 01, 2017	1,236.41	2,464.96	1,236.63	2,034.35
Apr 01, 2017	1,006.39	1,235.93	996.42	1,236.03
Mar 01, 2017	1,116.62	1,213.10	837.00	1,006.47
Feb 01, 2017	899.02	1,134.58	889.75	1,116.55
Jan 01, 2017	916.63	1,123.04	710.63	898.52
Dec 01, 2016	704.61	938.48	702.73	916.72
Nov 01, 2016	639.44	714.44	610.73	704.28
Oct 01, 2016	542.50	656.04	542.28	639.11
Sep 01, 2016	516.00	560.14	509.52	542.32
Aug 01, 2016	559.43	560.79	473.69	515.93
Jul 01, 2016	605.81	632.94	553.15	559.50
Jun 01, 2016	477.10	689.77	472.69	606.56
May 01, 2016	391.52	498.48	383.78	477.35
Apr 01, 2016	366.32	414.79	364.73	391.37
Mar 01, 2016	402.39	404.28	358.08	366.29
Feb 01, 2016	341.26	405.65	332.07	402.18
Jan 01, 2016	396.76	425.65	325.31	340.73
Dec 01, 2015	357.13	428.59	325.87	396.62
Nov 01, 2015	286.21	454.35	279.89	357.04
Oct 01, 2015	211.30	303.98	210.02	285.45
Sep 01, 2015	205.15	230.04	200.83	211.35
Aug 01, 2015	259.14	262.82	172.37	204.97
Jul 01, 2015	236.54	281.69	228.34	259.10
Jun 01, 2015	210.14	240.26	197.92	236.30
May 01, 2015	210.47	221.31	201.37	210.10
Apr 01, 2015	227.40	238.45	197.53	210.66
Mar 01, 2015	227.16	281.70	216.41	227.40
Feb 01, 2015	192.16	233.34	187.86	227.14
Jan 01, 2015	264.91	275.30	145.48	192.68
Dec 01, 2014	304.18	309.29	247.08	264.71
Nov 01, 2014	270.40	367.29	256.01	304.02
Oct 01, 2014	306.80	323.81	231.16	270.14
*Close price adjusted for splits.**Adjusted close price adjusted for splits and dividend and/or capital gain distributions.

Source: https://finance.yahoo.com/quote/BTC-EUR/history?period1=1410912000&period2=1689552000&interval=1mo&filter=history&frequency=1mo&includeAdjustedClose=true