*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970720010284
1970300306
1971700007
1972600107
1973500207
1974300003
1975600309
197610003013
197712007019
19789003012
19799019322
1980802101434
198113002015
198213005018
198314005019
198413005018
198514005019
198614005019
198710007118
1988120111024
1989170013737
19901910153469
19911210211852
1992120023136
19931601312472
1994150329110157
1995110626403446
1996130123097152
1997180520912955
1998130827612660
1999100128414453
2000211332636693
2001170123805846
2002100167910988
200310013911951245
200416054513321398
20051804104840966
200611041259901130
200719069210831200
20081572149652825
20091605179548748
2010901015712931469
201121172569391224
201212038512691369
2013400131337472
201400095317412
2015100382867
20163008213
2017000314
2018000000
Total612119219871582918531