*Excludes Observations that spanned multiple years

Pre 1970149
19705
19711
19721
19731
19740
19755
19763
19773
197810
19797
198014
19812
19823
19831
19841
19853
19860
19870
19880
19890
19901
19911
199218
199311
19942
19953
19962
19971
19983
19994
20000
20010
20024
20030
20040
20052
200612
20072
20088
200920
201073
20114
20122
20133
20140
20151
20160
20170
Total386