*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
19871
19881
19890
19900
19910
19924
19930
19943
19950
19960
19970
19980
19990
20004
20010
20020
200311
20040
20050
20060
20073
20080
20090
20102
20110
20120
20130
20140
20150
20160
20170
Total29