*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19750
19760
19770
19780
19791
19800
19810
19821
19830
19840
19850
19860
19871
19880
19890
19900
19910
19920
19930
19940
19951
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20061
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20180
20191
20201
20215
20222
20233
20241
Total19