*Excludes Observations that spanned multiple years

Pre 197012
19700
19710
19720
19730
19740
19750
19763
19771
19781
19794
19802
19813
19822
19833
19844
19852
19861
19872
19882
19892
19902
19912
19922
19932
19944
199518
19967
19978
199811
19996
20005
20015
20028
20032
200416
200561
20064
20070
200877
2009231
201066
20118
20124
20137
20141
20150
20162
20170
Total603