*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19950
19960
19970
19981
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20090
20100
20111
20120
20130
20140
20150
20160
20170
20180
20190
20202
20210
20221
20231
20241
Total17