*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197095001096
1970400105
1971800109
1972700108
19738002010
1974600208
1975800008
197611002013
197713004017
19789002011
197915001016
198015007022
198113003016
198215006021
198316003019
198417002019
198512102015
198618004022
198718007328
1988210011436
1989180118542
199020028535
19911508241764
1992161528959
1993231106631131
1994220417057253
1995213614047217
1996160119677290
199724025357136
1998200314116180
19991900202463
2000270418319233
200127061623198
200215222743296
2003202425823307
200424022117244
2005302206631149
200632121737215
2007281631329377
2008221113754215
200917019815131
2010190221022253
2011270212370222
201221204970142
201350014533183
201411092106200
201500123226
2016100269
2017111115
2018000000
Total860199634468535274