*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19790
19800
19810
19820
19831
19840
19851
19860
19870
19880
19890
19903
19911
19921
19933
19945
19950
19961
19972
19982
19990
20000
20011
20020
20031
20042
20050
20060
20072
20082
20090
20102
20112
20121
20130
20140
20150
20160
20170
Total35