*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19803
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19921
19930
19942
19951
19960
19971
19980
19993
20001
20012
20020
20030
20040
20051
20060
20070
20080
20099
20108
20116
20121
20130
20142
20151
20162
20170
20180
Total46