*Excludes Observations that spanned multiple years

Pre 197010
19701
19710
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19851
19862
19870
19880
19890
19900
19910
19920
19930
19940
19951
19962
19970
19980
19990
20000
20010
20020
20030
20040
20051
20060
20070
20080
20091
20100
20110
20120
20130
20140
20150
20160
20170
20182
20191
20200
20210
20220
20230
20240
Total24