*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19801
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19930
19940
19950
19961
19974
19981
19991
20005
20010
20020
20030
20040
20050
20061
20070
20080
20090
20107
20117
20120
20130
20141
20153
20165
20171
201821
20193
20200
20210
20220
Total66