*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970400307
1970000202
1971000101
1972000101
1973000101
1974000101
1975000404
1976200204
1977200406
1978100203
1979100618
1980000404
1981200305
19822008010
198310004014
198412003015
19858004113
198680112223
198770024233
198860123030
198970111423
199011119527
1991418261453
199282919223261
199381624613652
199490113025112561
199510172923562403
19969013423962440
1997131424327369
199811052916311676
19991101213871
200016033916191677
2001170137731786
20029114113291381
20031503319771026
200415012317961835
2005191342184249
20062210649351022
200718125812951374
2008110080560651
200950189180275
20101008156679853
201114123190431659
2012181243588652
20132113244616876
2014001104580685
2015000401454
2016101101426
201700110213
2018000000
Total3581412016692265424815