1-3 (Q1)	4-6 (Q2)	7-9(Q3)	10-12(Q4)	Total
2017	404	660	635	426	2125
2018	452	785	671	404	2312
2019	458	715	601	382	2162
2020	374	409	487	367	1637
2021	466	958	691	484	2599
	2694	3554	3085	2063

I am working on quantitative research and this chart shows the frequency at which unmanned aerial vehicles are discovered by manned aircraft by a quarter each year. What is the most appropriate method to verify the difference in the frequency of UAV detections summed for each quarter?

In which quarter is the highest frequency found? And which test method is appropriate to use?