*Excludes Observations that spanned multiple years

Pre 197016
19700
19710
19720
19730
19741
19750
19760
19771
19782
19791
19802
19810
19821
19831
19842
19850
19860
19870
19881
19891
19900
19910
19921
19930
19941
19950
19960
19970
19980
19991
20000
20011
20021
20030
20040
20051
20061
20070
20081
20092
201012
20118
20120
20132
20140
20150
20160
20171
201810
20190
20200
20210
20220
Total72