*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970020002
1970000000
1971000000
1972000000
1973000000
1974001001
1975001001
1976000000
1977000000
1978000000
1979000000
1980000000
1981000000
1982001001
1983000000
1984000000
1985101002
1986001001
1987002002
1988023005
1989045009
199001010011
19913810012
199223660044
199307740081
19942109700118
19951122500128
19960146300149
199707560081
19980112300115
199904340047
20000112800120
200108450089
20020147600153
200306890077
20041121300125
200507260078
200604050045
2007054160070
2008065130078
2009040170057
2010038490087
201103360039
201201120013
201312660033
201401600016
2015005005
2016031004
2017000000
Total111646242001899