*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19751
19760
19772
19781
19790
19800
19810
19820
19830
19841
19850
19861
19870
19880
19890
19900
19910
19920
19930
19941
19950
19960
19971
19980
19990
20001
20013
20020
20031
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20140
20150
20161
20170
20180
20190
20200
20210
Total20