*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19832
19841
19850
19860
19870
19880
19892
19900
19910
19922
19938
19944
19951
19960
19970
19980
19992
20005
20010
20020
20030
20040
20050
20060
20070
20081
20097
20100
20112
20120
20130
20140
20150
20160
20171
20181
20193
20201
20213
20222
20232
20241
Total52