*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19920
19930
19949
19950
19962
19973
19980
19990
20000
20010
20020
20031
20040
20051
20060
20070
20080
20092
20100
20111
20120
20131
20140
20150
20161
20170
20181
20190
20200
20210
20225
20232
20244
Total42