*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000014115
1970000101
1971000000
1972000000
1973000000
1974000000
1975000101
1976000000
1977000000
1978000000
1979000000
1980000101
1981000000
1982000101
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000000
1990000000
1991000000
1992000000
1993000000
1994000101
1995000101
1996000101
1997000303
1998000000
1999000101
2000000000
2001000202
2002000202
2003000303
2004000303
2005000000
2006000000
2007001203
2008000101
2009000101
2010000303
2011000909
2012000202
2013000101
2014000000
2015000101
2016000000
2017000000
2018000000
Total00155157