*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970015006
1970000000
1971000000
1972000000
1973001001
1974000000
1975000000
1976001001
1977004004
1978001001
1979104005
1980003003
1981005005
1982004004
1983001001
1984000000
1985003003
1986112004
1987009009
1988215008
198917100018
1990014200034
1991510180033
199206200026
1993016190035
1994017250042
199579310047
1996225160043
1997327420072
1998019400059
199929360047
200028830093
20012911700128
20023311300119
20032310500110
2004211690082
20051218700109
200619770087
2007012820094
2008279600105
20092712900138
201001413100145
201122116800191
201211212500138
201303590062
201406300036
201503120015
2016002002
2017000000
Total443111810002165