*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19870
19882
19890
19900
19910
19920
19931
19942
19954
19961
19974
19986
19996
20004
20011
20022
20033
20042
20050
20060
20070
20080
20090
20102
20110
20122
20130
20141
20150
20162
20170
20180
20193
20200
20211
20226
20233
20246
Total66