*Excludes Observations that spanned multiple years

Pre 197055
19700
19710
19720
19732
19743
19751
19763
19770
19783
19790
19802
19811
19820
19834
19840
19850
19860
19870
19881
19893
19903
19911
19920
19932
19942
19950
19962
19974
19980
19990
20001
20012
20023
20030
20040
20050
20062
20071
20080
20091
201021
20117
20125
20132
20140
20151
20163
20178
20189
20194
20200
20211
Total163