*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19882
19894
19901
19918
19920
19930
19940
19951
19960
19970
19980
19990
20000
20012
20020
20031
20040
20050
20060
20070
20081
20091
201030
201127
20120
20133
20143
20152
20165
20172
20181
Total95