How have Bitcoin returns, as a barometer of the cryptocurrency market, performed in May throughout history?

The chart below shows data statistics from third-party websites such as tradingview; from the chart, it can be seen that historically in May, Bitcoin has had more overall positive returns, but the difference is not significant. From 2012 to 2024, over 13 years, the rise and fall ratio is 7:6.
In the second year following the previous three halvings, namely: 2013, 2017, and 2021, the rise and fall ratio was 1:2; the average monthly return rate was approximately +10.2%, the maximum increase was +70.4% in 2017, and the maximum decrease was -35.1% in 2021.
Overall, Bitcoin's performance in May was quite volatile, with significant increases and noticeable declines. Years of increases are usually accompanied by positive market sentiment and strong investor demand, while years of declines may be influenced by macroeconomic factors, changes in regulatory policies, or market adjustments.