*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970001001
1971000000
1972000000
1973000000
1974000000
1975000000
1976001001
1977006006
1978011002
1979133007
1980053008
1981012003
1982013004
1983001001
1984001001
1985002002
1986112004
1987211004
19882280012
1989027009
199025130020
199174140025
1992018009
199306140020
1994111150027
1995419280051
1996725140046
1997179170097
1998149170067
1999619160041
2000224720098
20014267300103
20022399400135
20033556800126
20042306800100
20051427300116
2006334480085
20070734800121
20081319400126
2009022730095
20100519600147
201106312300186
20121615200114
2013013390052
201408270035
201500150015
2016000000
2017000000
Total548071263002124