*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973001001
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981100001
1982000000
1983000000
1984000415
1985000022
1986000044
1987300036
1988002204
1989000099
19901076115
1991001144257
19921011721397
199300117624
199460817738
1995004103145
1996000268
19971062312
19982003813
1999000123
2000000022
2001102014
2002002316
2003100304
2004002103
2005101608
2006100001
2007002305
2008001001
2009101013
2010103228
2011002103
2012102238
2013000000
2014000077
2015002002
2016000000
2017000000
2018000000
Total22081151155409