*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
19720
19730
19740
19750
19761
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19983
19990
20000
20010
20020
20031
20040
20050
20060
20070
20080
20090
20100
20111
20120
20131
20141
20150
20162
20170
20180
20190
20200
20210
20223
20236
20242
Total30