*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19831
19841
19850
19863
19870
19880
19890
19901
199123
199222
199319
199411
19951
19960
19970
19980
19990
20000
20010
20020
20030
20041
20050
20061
20070
20080
20090
201011
201117
20120
20130
20141
201512
20169
20171
20189
20198
20202
20216
20221
20232
20240
Total165