*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19731
19742
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19851
19860
19870
19881
19890
19901
19910
19920
19931
19940
19950
19962
19971
19980
19990
20001
20010
20020
20031
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total18