*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19890
19901
19910
19920
19931
19940
19950
19960
19971
19980
19990
20001
20010
20020
20032
20040
20050
20060
20070
20080
20091
20103
20110
20120
20132
20141
20150
20160
20170
20180
20190
20200
20211
20220
20230
20240
Total20