*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19891
19900
199115
19921
19930
19940
19950
19961
19970
19980
19990
20000
20010
20021
20030
20040
20050
20062
20070
20082
20091
20100
20112
20121
20133
20141
20150
20160
20172
20181
20190
20200
20210
20220
Total36