*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19832
19840
19850
19860
19870
19882
19895
19902
19915
19922
19935
199426
19952
19969
19973
199810
19991
20001
20013
20024
20030
20045
200512
20062
20070
20085
20090
201041
201146
20120
20130
20140
20150
20166
20170
Total201