*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19872
19881
19890
19901
19911
19920
19934
19942
19950
19962
19970
19980
19992
20007
20010
20020
20030
20040
20051
20060
20070
20081
20090
20104
20110
20122
20135
20140
20152
20163
20170
20181
20190
20200
20210
20220
Total42