*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
19909
19911
199212
19930
19944
19954
19964
19971
19981
19991
20006
20012
20020
20036
20045
20054
20066
20070
20084
20093
20104
20110
20120
20130
20140
20150
20160
20170
Total77