*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19753
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19922
19930
19940
19950
19960
19970
19980
19994
20006
20017
20029
20035
20040
20050
20060
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total38