*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000101516
1970001012
1971000000
1972001023
1973001012
1974001023
1975000000
1976002024
1977005049
1978000044
1979002024
1980003058
19811060310
1982003069
1983002024
1984003069
1985012047
1986014038
19870050611
198801100718
198900150520
19902690421
199138180130
199212160221
199312300639
199434420554
199514380548
199621260635
199711180727
199811380747
1999201801030
200030310741
200113240735
200211400850
200314200530
200411260533
2005252801348
2006033101145
2007134621365
2008014411359
200901440348
201001620063
20113310806120
2012111201226
201321300033
2014021180140
201502110013
2016002002
2017000000
Total348389732371254