*Excludes Observations that spanned multiple years

Pre 197044
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19841
19850
19860
19870
19880
19890
19900
19910
19924
19930
19940
19950
19961
19970
19980
19990
20001
20010
20020
20030
20040
20050
20060
20070
20080
20090
20103
20112
20120
20130
20141
20150
20160
20170
Total58