*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000011011
1970000303
1971000202
1972000000
1973000505
1974000101
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000000
1983000000
1984000000
1985000101
1986000101
1987000101
1988000303
1989000000
1990000202
1991000404
1992000202
1993000202
1994000909
1995200103
1996000101
1997000202
1998000404
1999000101
20001108010
200110011012
2002000303
200300010010
2004000202
2005000303
2006000101
2007000000
2008100304
2009000000
2010000101
2011000303
2012000404
2013000202
2014000000
2015000101
2016000000
2017000000
2018000000
Total5101080114