*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19851
19862
19871
19880
19890
19900
19912
19920
19931
19940
19950
19960
19970
19980
19991
20000
20011
20020
20030
20040
20051
20060
20070
20080
20090
20100
20112
20120
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20240
Total13