*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700050712
1970000000
1971000022
1972000011
1973000011
1974000011
1975000011
1976000033
1977000011
1978000022
1979000011
1980000011
1981000044
1982000022
1983001012
1984000033
1985000033
1986001045
1987001023
1988000022
1989000011
1990000066
1991002013
1992001034
1993000022
1994000000
1995006017
1996008019
1997002013
1998003047
1999000044
2000004026
2001002057
2002004004
2003001001
2004001102
2005001012
2006001023
2007002002
2008002024
2009003036
2010001001
2011001012
2012000000
2013008008
2014000000
2015000000
2016000000
2017001001
Total0062182145