*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970001012
1970000000
1971000033
1972000022
1973000022
1974000011
1975000011
1976000044
1977000055
1978000022
1979000044
1980001034
1981000066
1982000055
198300101011
1984000099
1985000077
198600301114
198700801220
198801201720
198903201318
199014401524
199161951031
1992481711545
1993126911754
199424932022105
1995761002346
19961133412069
1997125903166
19983392202589
19992241402262
20002232713285
20011213313288
20021234722295
20033343622499
20041482002897
200534440133121
200612574132133
200763773631153
2008134113932189
2009110115026152
2010317157139217
201106244134285
20120777249135
2013114115110141
2014013151231
201500180119
2016003003
2017002002
Total525551387377452776