*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
199522
19961
19970
19980
19994
20000
20014
20028
20032
20043
20051
20061
20070
20084
20090
201015
201134
20122
20136
20145
20150
20160
20170
Total113