*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19781
19790
19800
19810
19821
19830
19840
19853
19860
19872
19882
19890
19901
19910
19922
19931
19944
19950
19965
19970
19983
19992
200012
20012
20020
20033
20043
20051
20064
20076
20087
20097
20109
201111
20126
20137
201422
20157
20169
20170
20188
20192
20202
20213
20225
20230
20243
Total167