*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000101
1975000000
1976000000
1977100001
1978000000
1979000000
1980000000
1981000101
1982000011
1983000000
1984000000
1985000000
1986000000
1987000000
1988000000
1989000202
1990000101
1991000000
1992000303
1993000202
1994000202
1995000303
1996000808
1997000505
1998000202
1999000404
2000000202
2001000606
200200010010
2003000303
200400011011
2005000101
2006000505
200700010010
2008000909
200900011011
201000113115
201100013013
2012000202
2013000101
2014000000
2015000303
2016000101
2017000000
2018000000
Total1011352139