*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19831
19843
19850
19862
19870
19882
19890
19901
19910
19921
19933
19940
19951
19960
19973
19980
19991
20004
20015
20024
20035
20042
20051
20060
20072
20080
20090
20100
20111
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total43