*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970202004
1970001001
1971000000
1972001001
1973001001
1974002002
1975003003
1976005005
1977008008
1978104005
1979007007
1980008008
1981005005
1982008008
1983003003
1984007007
1985013004
198601100011
198703120015
1988108009
198909160025
1990044150059
1991118280047
199258240037
19931128270066
199431085000161
19959682800105
1996671210098
199762542100281
199851912400220
199921432400169
200032153500253
200151082600139
20021905500146
200301265600182
200401194400163
2005212210200226
2006115811800277
2007111611800235
200823716200201
200914118600228
201035225600311
201135629500354
2012410511200221
20132148600102
20144258700116
2015622440072
2016101002
2017000000
Total9123532159004603