*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000022
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982003003
1983000000
1984007018
1985000000
1986000011
1987000011
1988000011
1989001012
1990000011
1991001001
1992000011
1993016018
1994000022
1995000011
1996002035
1997001001
199811110114
1999000011
2000010023
2001000055
2002003014
2003002035
20042180112
200520120620
200610230327
200710301638
200800100212
200900150015
2010028120343
2011012250037
201203260240
201327460156
201407260033
2015002002
2016000000
2017010001
Total991252153406