*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100001
1970000000
1971000000
1972000011
1973000000
1974000000
1975000000
1976000000
1977000022
1978000011
1979001012
1980000011
1981000011
1982001023
1983000011
1984000022
1985000011
1986000011
1987001012
1988000033
1989004048
1990001034
1991005027
1992004037
1993003025
1994002079
1995005038
1996002035
1997006039
1998001045
19990040711
20000050510
200100120719
200200100414
2003003047
2004002046
2005002046
20060060511
20070050611
20080080412
20090090514
2010008019
201100300232
2012002035
2013009009
2014000000
2015001001
2016001001
2017000000
Total101530113267