*Excludes Observations that spanned multiple years

Pre 1970115
19700
19711
19720
19731
19740
19751
19760
19771
19780
197916
19800
19812
19820
19830
19840
19850
19860
19870
19880
19891
19900
199114
199212
19937
19945
19953
19962
19970
19981
19990
20000
20011
20022
200315
200410
20050
20067
200727
200823
200924
20101
20116
20120
20134
20141
20151
20160
20170
Total304