*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100001
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976100102
1977000213
1978000101
1979000202
1980000303
1981000505
1982000303
1983000202
1984000101
1985000404
1986000213
1987002338
1988000123
1989000448
19900012811
1991002237
1992000369
19930013812
199400261523
19950017917
199600351422
199700183948
199800224650
1999001141833
2000001112941
200100252027
2002000232548
2003000151429
20040011980100
2005001173755
2006100283564
2007003273161
2008001322457
2009000472875
2010000393170
201100251760
2012001293464
2013000251944
2014000242347
201500015823
2016000505
2017000000
2018000000
Total30284986221151