*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19912
19920
19933
19941
19950
19963
19971
19981
19991
20006
20012
20028
200314
20047
200512
200617
200712
20087
20094
201021
201110
20128
20137
20149
20157
20161
20170
20180
Total164