*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197047012050
1970100001
1971500005
1972400004
1973300003
1974100034
19752002610
19765002310
197760011522
19784005211
197950011117
1980400509
198150012118
19828007015
1983300519
1984600208
1985501309
198660212222
1987140213130
1988120311632
19899017825
199080114528
199160332748
199270322436
19931101281252
19941403461275
1995100348667
199690330850
19971602311059
19981303452081
199980027944
2000150336660
2001150122644
200250038245
2003100336352
2004130027747
2005140246769
20061511785100
2007171148370
2008111066179
20093021201126
20102031245134
20116011674178
201216001185139
2013400981103
2014000808
201510012114
2016000303
2017000000
2018000000
Total40434914801892125