*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19841
19850
19863
19871
19880
19890
19900
19910
19922
19930
19941
19950
19960
19971
19980
19991
20001
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20162
20170
20180
20190
20200
20210
20220
20234
20240
Total19