*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19871
19880
19890
19901
19918
19920
19930
19944
19950
19961
19972
19981
19990
20000
20011
20020
20030
20049
20057
20068
20076
200813
200932
201040
201116
201258
201321
201413
201520
201631
20170
20184
20192
20207
20210
20224
20236
20245
Total323