*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19721
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19861
19870
19881
19890
19901
19910
19920
19930
19940
19950
19960
19970
19980
19991
20000
20010
20020
20030
20040
20050
20060
20070
20081
20090
20100
20110
20120
20130
20140
20151
20161
20170
20180
20190
20200
20211
20220
20230
20240
Total16