*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19915
19920
19930
19943
19951
199610
19973
19981
19990
20000
20010
20020
20030
20041
20050
20060
20070
20085
200916
201017
20118
20129
201311
201411
20157
20166
20170
20180
20190
20200
20210
20220
20230
20240
Total117