*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970011002
1970001001
1971000000
1972000000
1973000000
1974000000
1975003003
1976000000
1977002002
1978000000
1979000000
1980000000
1981001001
1982005005
1983000000
1984005005
1985112004
1986012003
198715130019
198801200021
198906160022
199013120034
199151360024
1992398200103
19930429700436
19945102226001053
19952910400916
19964873600883
199734191200434
19981794500800
19990293800301
20004115321001178
200147871300804
20021116126001188
200318542300878
20041136211001374
200524353200469
200604833500518
200735696600638
200824325500489
200912037100275
2010242013000552
2011015014000290
201221871200201
201383105100369
201402721100283
201503170020
201601700017
2017020002
Total57136978630014617