*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19892
19901
19910
19920
19930
19940
19951
19960
19970
19980
19991
20005
20010
20027
20030
20042
20050
20065
20070
20086
20093
20102
20114
20126
20130
20140
20150
201611
20170
Total58