*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970601007
1970000000
1971000000
1972000000
1973400004
1974100012
1975200002
1976300014
1977400015
1978200013
1979400105
1980100001
1981300104
1982500005
1983100102
1984600006
1985400004
1986400408
1987500409
19888003011
19898004113
19909007117
199140216224
199280215126
1993100117331
1994110119233
199580416230
199670212223
1997110211125
1998100322338
199990011020
2000110017230
2001130224140
200240129236
2003100324340
200410039224
2005140216335
2006110221337
2007130121035
200882139050
200950235042
201060447158
201150156163
2012220027049
201360013423
201400010010
2015000909
2016101013
2017000303
2018000000
Total29724156445949