*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19742
19751
19760
19770
19780
19791
19801
19810
19820
19830
19840
19858
19861
19871
19880
19890
19908
19910
19924
19935
19940
19950
19961
19972
19980
19990
20000
20010
20020
20036
20046
20051
20061
20076
20086
200912
201018
20113
20126
20139
20147
20159
20165
20176
201810
20194
20200
20210
20226
20230
20240
Total156