*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19980
19991
20004
20012
20020
20033
20044
20054
20061
20075
20084
20091
20100
20113
20124
20133
20142
20151
20166
201717
201821
201915
202011
202123
202227
202355
20249
Total228