*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19831
19840
19850
19861
19870
19880
19891
19900
19910
19921
19933
19940
19957
19964
19975
19980
19990
20000
20011
20021
20031
20041
20051
20060
20070
20080
20090
20100
20112
20120
20130
20140
20150
20161
20170
20180
20190
20200
20210
20220
Total33