*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19930
19940
19951
19960
19979
19983
19990
20000
20010
20020
20030
20040
20051
20063
20071
20082
20090
20105
20117
20123
20134
20143
20156
20161
20173
20180
Total53