*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19901
19912
19920
19933
19941
19950
19963
19971
19981
19991
20006
20012
20028
200314
20047
200514
200618
200712
20087
20094
201021
201110
20128
20137
20149
20157
20161
20170
20180
20190
20200
20210
20220
Total171