*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970000000
1971000000
1972000000
1973001001
1974000000
1975003003
1976001001
1977002002
1978000000
1979000022
1980011002
1981000000
1982002002
1983000000
1984008008
1985000000
1986001001
198700170118
198800210021
198902280030
199001300013
1991002002
1992041005
19930840113
199403490144
19950820111
199605440058
19970232401237
19980236400240
19990231200233
20001335201339
20010260900269
200202481600264
200302951400309
20040273400277
200512561200269
200602321400246
200701891600205
200802330035
2009021660087
2010050915700666
201102713600163
201203300033
201309170026
2014123130037
201501150016
2016002002
2017000000
Total33537644084192