*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19801
19810
19820
19830
19840
19850
19861
19870
198818
19890
19901
199112
19921
199317
19946
19958
19968
199720
19983
19990
20000
20013
20022
20030
20041
20053
20062
20070
20080
20091
201018
20111
20121
20131
20143
20152
201620
201719
201836
201933
202024
202125
202220
20230
20241
Total313