*Excludes Observations that spanned multiple years

Pre 19702
19701
19712
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19871
19880
19890
19906
19910
19921
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20171
20180
20190
20200
20210
20220
20230
20240
Total16