*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000220022
1970000000
1971000000
1972002002
1973001001
1974003003
1975003003
1976002002
1977000000
1978001001
1979003003
1980000000
1981002002
1982001001
1983001001
1984000000
1985006006
1986001001
1987001001
1988002002
1989001001
1990003003
1991001001
1992001001
1993002002
1994003003
1995001001
1996000000
1997001001
1998005005
1999000000
2000001001
2001000000
2002000000
2003001001
2004000000
2005002002
2006000000
2007000000
2008002002
2009000000
2010001001
2011001001
2012001001
2013000000
2014001001
2015000000
2016000000
2017000000
2018001001
2019000000
2020000000
2021000000
2022000000
Total00800080