*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197093000093
1970400004
197110000010
1972400004
1973700007
1974500106
1975800008
197612001013
197713002015
197812000012
197915000015
198016001017
198117001018
198221001022
198317002019
198423001024
198520002022
198621005026
198721106028
198824004028
198921005026
199021003024
1991200040060
1992240023047
1993331023057
1994322014048
1995351026062
1996260026052
1997332018053
1998350035070
1999250035161
2000390029068
2001300013043
2002180017035
2003190012031
200420006026
2005270025052
2006281022051
2007383013054
2008327021060
2009200019039
2010190025044
2011161049066
2012380024062
201340022026
2014010809
2015600129
201610002012
2017400004
2018100001
Total103720058331643