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*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19873
19880
19891
19901
19916
19921
19931
19944
19951
19960
19972
19980
19990
20000
20010
20020
20031
20040
20051
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
20181
20192
20200
20210
Total30