*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19701380113
1970004004
1971002002
1972001001
1973001001
1974121004
1975023005
1976013004
19770180211
1978014005
197910100011
1980105006
1981005005
1982006006
1983018009
198400110011
1985114006
19860390012
198706160022
198805110016
1989110170028
1990712130032
19911516260057
19921330260069
1993211133000164
1994183114500374
1995102363803287
1996112063200249
199731413802184
199872513600294
19993963000129
2000103225201385
200151354100181
200262685501330
200392314500285
2004154245000489
200581357200215
2006837415001533
2007922010500334
2008412914100274
2009615718700350
2010914923500393
2011614622800380
20121630719600519
20132944839500872
20142855036000938
201540653559011253
201632722651031408
201760817748001625
201851765789011606
201934785657001476
202052894989011936
202139691668001398
202238625487001150
Total62811395831101720351