*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197001520017
1970000000
1971020002
1972110002
1973010001
1974000000
1975010001
1976110002
1977000000
1978000000
1979011002
1980002002
1981012003
1982011002
1983000000
1984000000
1985000000
1986020002
1987001001
1988000000
1989001001
1990040004
1991011002
1992010001
1993011002
19942830013
1995051006
1996160007
199703810039
199811800019
199901020012
200006220064
200102920031
200206160067
200304650051
200407060076
20051102900112
2006037270064
200709320095
200808030083
200901082900137
201003270039
2011023120035
201208360089
201301141300127
201401401400154
2015072009
2016001001
2017000000
Total71205165001377