*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000000
1972000000
1973200204
1974000000
1975000000
1976000202
1977000202
1978000101
1979000606
1980000303
1981000404
1982000707
1983100203
1984100203
1985002002
19862019012
19870019010
1988101619
198940211118
199020414323
199100261265
199200119020
199310230336
199430533647
199520447659
199600241245
199750139348
199850024635
199980126237
200030519330
200120625134
200200138140
200340142754
200420033338
200530043248
200650242150
200730251056
200810068170
20090041170121
20100051213129
20111041890194
201200168069
201320141044
201410019222
201500011011
2016000202
2017000606
2018000000
Total640611337591521