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*Excludes Observations that spanned multiple years

Pre 19703
19700
19712
197215
197310
19740
19750
19762
19771
19786
19790
19800
19810
19820
19830
19844
19851
198610
198710
198829
19894
199017
199116
199211
199313
199410
199514
19965
19975
19983
199916
20003
20011
20021
20031
20041
20051
20065
20071
20082
20097
20104
20117
201218
201321
20145
201511
20164
20174
20183
20190
20202
20210
Total309