*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000101
1971000101
1972000101
1973000101
1974000101
1975000101
1976000101
1977000101
1978000000
1979000202
1980000112
1981000000
1982000202
1983000101
1984000202
1985000202
1986000505
1987000303
1988000325
1989000404
1990000325
1991001528
1992000639
199300021627
199400021122
199500318223
199600016319
199700010212
199800021122
1999000516
200000120425
200100014115
200200017017
200300012012
200400120324
200500021122
2006000909
200700020020
200800029130
200900013013
201000029130
201100035540
2012000011
2013000404
2014000303
2015000000
2016000000
2017000000
2018000000
Total00640543454