*Excludes Observations that spanned multiple years

Pre 19702
19704
19711
19721
19731
19740
19750
19760
19771
19780
19790
19800
19810
19820
19831
19841
19850
19860
19870
19881
19892
19901
19910
19920
19936
19940
19953
19960
19970
19980
19991
20000
20010
20020
20030
20040
20051
20060
20070
20080
20090
20100
20110
20120
20130
20140
20151
20160
20170
20180
20190
20200
20210
20220
20230
Total28