*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700070310
1970000000
1971000000
1972000011
1973000000
1974000000
1975000000
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982000011
1983000000
1984000000
1985000011
1986000000
1987000000
1988000011
1989001001
1990101002
1991001012
1992001001
1993001023
1994404008
1995101002
1996000000
1997001001
1998100001
1999001001
2000000000
2001000000
2002000000
2003000000
2004000000
2005106018
2006502018
2007115007
2008001023
2009104005
201080100321
2011004059
201220100113
2013103026
2014206008
2015102003
2016000011
20170090211
2018006028
2019106018
2020002057
2021000000
2022000000
2023000000
Total30195036162