*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971000000
1972000000
1973000000
1974000000
1975100102
1976100001
1977100304
1978000000
1979000000
1980000101
1981000101
1982100304
1983100001
1984000000
1985000000
1986100247
1987001214
1988000516
1989000268
199000411924
199100261624
199210117625
1993000162238
1994001141732
1995002281545
1996000132538
1997001271139
1998002321448
199910215927
2000001381251
200100035540
2002000451257
2003002322660
2004000331548
20051022884115
2006002264775
200700035338
200800043447
200900260365
20100047665145
2011100641277
2012400272354
201300024327
20140009312
2015001708
201600048048
2017000000
2018000000
Total140328194831348