*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19843
19850
19860
19871
19880
19890
19900
19910
19920
19930
19942
19951
19962
19970
19981
19990
20000
20010
20020
20030
20040
20050
20061
20071
20083
20091
20100
20110
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total21