*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977002002
1978001001
1979001001
1980000000
1981001001
1982001001
1983000000
1984000000
1985004004
1986023005
1987017008
19880380011
1989018009
199001310014
19911840013
199215060057
199307980087
1994276140092
1995066110077
199606950074
1997142120055
199809180099
199902670033
2000166100077
2001053130066
2002067110078
2003164130078
20042931300108
2005178110090
2006166150082
20070673600103
2008057250082
2009116250042
2010020570077
201104540058
201201240025
201301670023
201401640020
201501100011
2016012003
2017000000
Total121213445001670