*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970015006
1970003003
1971000000
1972001001
1973002002
1974000000
1975003003
1976003003
1977003003
1978001001
1979004004
1980103004
1981012003
1982036009
1983001001
1984004004
1985102003
1986035008
198712100013
1988007007
198915170023
1990342100055
1991320140037
1992315180036
199321181400134
199432214700271
199531832800214
199682781800304
199755163100552
199834492600478
199933272100351
200085554200605
200198583500902
200205756400639
20032118358001243
20044126052001316
200527228100805
2006861812600752
2007161615000767
2008476616200932
2009538019400579
2010139535500751
2011114034700488
2012138112200504
201364419900546
201412896700357
2015133650099
2016027130040
2017000000
Total941142323410013858