*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19757
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19906
19911
19925
19931
19940
19950
19960
19971
19984
19997
20005
20013
20020
20031
20043
200510
20060
20070
20082
20090
20100
20116
20122
201312
20140
20150
20160
20171
20180
20190
20200
20210
20220
20230
20240
Total79