*Excludes Observations that spanned multiple years

Pre 197035
19702
19710
19721
19731
19740
19750
19761
19774
19780
19791
19805
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19972
19981
19992
20001
20011
20021
20031
20048
20056
20064
20071
20084
20096
20103
20111
20123
20133
20140
20150
20160
20170
Total98