*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197038007348
1970100708
1971400004
1972000000
1973200204
1974200103
1975300317
19767002110
197740014018
197830010013
197940022531
19800019414
19817007115
19824007112
1983100405
1984200608
1985100304
19864009114
198770020128
198870010118
1989110019737
1990400184062
1991501173255
1992701202856
199320727139175
199410358377439
1995301136600650
199610659263329
19974073418841929
199850136013901468
19994013811661209
200012153916071664
20019024016531704
200220214419342082
200320710324952607
200450213827562901
200570441118222244
200630544023012749
200720318821252318
200830829011901491
200910639213571756
201000947317752257
201150249510171519
201240348518582350
201300147210951568
20140013256991025
201520390108203
201610078584
2017101114
2018000000
Total207111551333174337199