*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197024013028
1970300317
1971400105
1972500207
1973400105
1974300104
1975400307
1976601209
19775016012
197860015021
197960915030
198050185331
198190221234
1982100713131
198390169236
198450134830
1985300216
1986120118233
1987162017641
1988120223441
1989150129853
1990130283437112
1991120164530103
19921207818108
19932101216518216
19941801526857358
19952301019119243
1996180919235254
19972201215439227
1998180919161279
199921089331153
2000270621740290
20012302022315281
2002180112506285
20031902727316335
20041602326510314
20052301520211251
20062802827118345
200734122128721375
200828103035646470
20092702146323534
20102003647622554
20113011259611650
201270062516333
201337054139464
201401513882226
201550766918168
2016614929186
20170056213
2018000000
Total7552759463927308498