*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19923
19931
19941
19951
19960
19972
19982
19994
20003
20012
20023
20035
20045
20059
20069
20077
200810
20093
20102
20110
20121
20130
20140
20150
20160
20170
Total75