*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19865
19871
19881
19898
19901
19911
19924
199314
19941
19951
19960
199717
19982
19990
20000
20012
20020
20030
20042
20051
20060
20071
20086
20091
20108
20115
20120
20130
20141
20150
20160
20170
Total83