*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19862
19872
19884
19891
19901
19910
199210
199325
199413
19956
19969
19975
19984
199946
20009
20014
20024
20033
20044
20057
20061
20071
20081
20090
201054
201170
20128
201311
201415
20150
20161
20170
Total323