*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
19882
19890
19902
19913
19923
19933
19944
19957
19962
19970
19987
19999
20000
20010
20027
20030
20047
20051
20060
20070
20084
20093
20100
20110
20120
20130
20140
20150
20164
20170
Total68