*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197094000094
1970300003
1971700007
1972500005
1973400105
1974500106
1975500308
1976500106
19778003011
1978500106
197970010017
19807003010
19818004012
19829002011
1983800008
198411001012
1985600017
198612008626
1987120010426
198813005018
19898006721
199090072137
1991701181642
1992602291451
1993902421669
199490110849167
1995100313013156
1996110712044182
1997120123252297
1998100024438292
1999120014327182
2000150224342302
2001130435921397
200290225732300
2003140031520349
2004120225641311
20051202310123447
20061201214131358
2007173114014175
20087508022114
200930012350176
2010502127103237
2011600136143285
201270076100183
2013101571675
2014000432770
2015100251743
201600042749
2017000101
2018000000
Total471834393612175666