*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19834
19840
19850
19860
19874
198827
19890
19903
19913
19923
19930
19946
19950
19965
19971
19985
19990
20001
20010
20020
20030
20042
20051
20063
20070
20082
20091
20102
20111
20120
20131
20140
20150
20160
20170
Total75