*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000202
1980000000
1981000000
1982000000
1983000000
1984000000
1985000101
1986000202
1987000303
1988000303
1989000000
1990000101
1991000707
1992000404
1993000101
1994000303
199500012012
1996000808
1997000505
199800010010
1999000707
200000029029
200100032032
200200025025
200300028028
2004000505
2005000909
2006000404
2007000606
2008000909
2009000808
2010000606
201100012012
2012000606
2013000202
2014000000
2015000101
2016000000
2017000000
2018000000
Total0002510251