*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000112
1970000101
1971000000
1972000000
1973000000
1974000000
1975000303
1976000000
1977000202
1978000000
1979000000
1980000000
1981000101
1982000505
1983000000
1984000505
1985001214
1986000213
198700113519
198800020121
198900016622
199000123134
199100561324
1992003298103
19930007429436
19940052610221053
19950024910916
19960046873883
199700312419434
19980015794800
19990008293301
20000042111531178
200100413787804
20020012611611188
200300123854878
20040011113621374
200500232435469
200600035483518
200700366569638
200800255432489
200900171203275
2010002130420552
2011000140150290
201200212187201
201300851310369
201400011272283
201500017320
201600001717
2017000022
2018000000
Total00578631369714617