*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19841
19850
19862
19872
19884
19891
19901
19910
199211
199327
199413
19957
19969
19975
19984
199946
200010
20015
20024
20033
20044
20057
20062
20071
20081
20092
201055
201175
20128
201311
201415
20159
20167
20170
20180
Total354