*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197051005258
1970200406
1971700108
1972400206
19736004010
1974500308
19758004113
19766004010
197712008020
19788004012
1979100011021
198011016220
198115006021
1982160010127
198316004020
1984110012023
198512005118
1986100016127
1987160033352
1988170127146
19891600441272
19901101206092
19911003303275
19921401124120169
1993140538457514
1994210158217781896
1995222143515401613
1996161134414531527
1997211124111801255
1998181224916481738
19991811234680745
2000301156418751985
2001331176715451663
2002172510417191847
2003161107821762281
2004200109326372760
20052401016411101308
20062711527013451658
20072621827214631781
2008142103649991389
200912117451470951
2010131317218791645
2011241227685001315
20123716273666983
201330216056471276
201400103617711142
201550517934223
201612506831116
20175713319
2018000000
Total7423233355152784234464