*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19761
19770
19780
19791
19800
19810
19820
19830
19840
19850
19864
19870
19881
19890
19901
19910
19920
19932
19940
19953
19960
19970
19980
19990
20000
20010
20020
20030
20040
20056
20061
20070
20082
20090
20100
20110
20120
20130
20140
20150
20160
20175
20181
20190
20200
20210
20220
20233
20240
Total31