*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19891
19901
19910
19922
19930
19941
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20083
20090
20100
20110
20121
20130
20141
20150
20160
20170
20180
20193
20206
20218
20224
20231
20240
Total32