*Excludes Observations that spanned multiple years

Pre 1970104
19703
19710
19723
19733
19740
19752
19763
19774
19782
197910
19808
19814
19822
19833
19841
19852
19861
19871
19881
19890
19904
19914
199211
19933
19946
19959
19967
199712
199814
19995
20007
20014
20024
20033
200415
20053
20069
20071
20086
20090
20107
20118
20128
20133
20142
20157
201610
20174
Total333