*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970004004
1970000000
1971000000
1972000000
1973000000
1974001001
1975010001
1976001001
1977004004
1978001001
1979035008
1980005005
1981012003
1982003003
1983003003
1984001001
1985002002
1986101002
1987112004
1988042006
19891980018
199031370023
19910790016
19924660016
199319100020
1994230100042
199529120023
199622390034
1997052190071
1998142160160
1999042110053
2000242140058
2001343110057
2002073200093
2003138180057
2004052110063
2005221120035
20062783700117
2007149300080
2008128280057
2009539440088
2010138540093
2011227400069
2012020200040
20130705500125
2014141440086
201505220027
2016006006
2017010001
Total39917620011577