*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000101
1979000000
1980000000
1981000101
1982000000
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989001001
1990000000
1991000202
1992200002
1993000000
1994000404
1995001001
1996100001
1997100203
1998000303
1999100203
2000100203
2001000101
2002100102
2003200002
2004100203
2005002002
2006104308
20072054011
2008001102
2009000000
2010000101
2011000213
2012100102
2013001203
2014001102
2015100203
2016001203
2017000000
2018000000
Total1501741174