*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970500005
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976400004
1977200002
1978200002
1979200103
1980300407
1981200305
1982100001
1983200002
1984400004
1985100001
1986000101
1987400509
1988300306
1989000000
1990100001
1991200305
1992300508
199381019028
1994300609
1995420107
1996400408
199710103014
1998200002
1999000000
2000800008
2001110018029
20023007010
2003100102
20044006010
200513006019
2006210017038
20078004012
200811010012
2009100001
2010000101
2011460035081
20129430210118
2013400206
2014100001
2015100304
2016000505
2017700007
2018300003
Total299801940501