*Excludes Observations that spanned multiple years

Pre 19703
19701
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19891
19901
19911
19922
19931
19941
19951
19960
19970
19980
19996
200014
20012
20020
20031
20040
20050
20060
20070
20080
20090
20101
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total37