*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
19878
19886
19890
199022
19918
19924
199310
19942
19951
19960
19970
19980
19990
20000
20012
20020
20031
20041
20050
20060
20070
20082
20090
20103
20116
20122
20132
20142
20151
20162
20176
20180
Total91