*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19793
19801
19811
19820
19830
19841
19851
19860
19870
19883
19891
19901
19910
19920
19930
19949
199516
199615
199740
199822
199919
200019
200122
200222
200325
200424
200514
200622
200722
200812
200918
201034
201119
201224
201313
201423
201512
20160
20170
20180
Total459