*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19863
19878
19880
19894
19901
19910
19920
19930
19940
199516
19960
19970
19983
19992
20003
20010
20020
20030
20040
20051
20060
20079
20080
20092
20106
20113
20120
20130
20140
20151
20160
20170
Total63