*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974000022
1975000022
1976000202
1977000202
1978000000
1979000268
1980000549
1981000213
1982000202
1983000213
1984000101
1985000101
1986000011
1987000145
1988000314
198900011415
199000011213
1991000156
19920004711
199300022224
199400166774
199500281525
199600253037
19970018131140
199800158490
1999001127083
20000006194200
20010005132137
20020009213222
200300312207222
200400024246270
200500211155168
200600128444473
200700115314330
200800120241262
200900060220280
201000333481517
201100147380428
20120009841850
201300017247264
20140009247256
201500071320
2016000303
2017000000
2018000000
Total002039150545465