*Excludes Observations that spanned multiple years

Pre 1970322
197047
19710
19725
19733
19744
197513
19761
19772
19788
19794
19809
19813
19820
19831
19846
19853
19862
19870
19880
19892
19902
19915
19920
19931
19940
19956
19964
199710
19982
19994
200014
200128
200266
200317
200421
200516
200643
200727
200827
200997
2010294
2011407
2012516
2013743
2014531
201577
201647
201749
201837
201943
202015
20218
Total3592