*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
199219
19935
19940
199510
199614
199750
19981
199929
20003
200133
20029
200317
200473
20056
200623
20071
20081
20091
201023
201129
20129
201350
201485
2015108
2016122
2017215
2018170
2019164
20200
20210
20220
Total1271