*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970900009
1970100001
1971000000
1972000000
1973000000
1974000101
1975100102
1976100001
1977100304
1978000000
1979100102
1980200103
1981100001
1982101103
1983102104
198400625031
19857034115
1986100102
1987100304
1988201104
1989300205
19902035212
199110111215
199220013015
199330621030
1994170920248
1995170523247
1996200818046
1997120915137
19981701129057
1999220726156
200060461071
2001210624051
2002260727161
2003290922060
200470720034
2005260213041
2006210026047
2007120124037
200870042049
200980055063
201040065170
201150275183
2012140052066
201330030033
201400011011
2015100719
2016102519
2017100001
2018000000
Total3380112785161251