*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000101
1980000202
1981000101
1982000000
1983000000
1984000000
1985000000
1986000000
1987000101
1988000101
1989000011
1990000011
1991000101
1992000101
1993000011
1994000235
1995000101
1996000044
1997000022
1998000033
1999000112
2000000235
2001000336
2002000527
200300010313
2004000246
20050005510
2006000347
20070005914
2008000437
20090009110
201000011112
201100021021
2012000099
201300071118
20140003912
2015000202
2016000101
2017000000
2018000000
Total00010583188