*Excludes Observations that spanned multiple years

Pre 197050
19700
19710
19720
19732
19740
19752
19761
19770
19780
19793
19800
19811
19821
19833
19842
19856
19860
19872
19881
19891
19902
19912
19922
19932
19945
19953
19963
19975
19987
19995
20009
20019
200211
200311
2004152
2005134
200696
200796
2008252
200999
2010264
2011115
2012246
201368
20142
20158
20167
20175
Total1695