*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000101
1970000000
1971000000
1972000000
1973000000
1974000000
1975000000
1976000101
1977000101
1978000000
1979000303
1980000000
1981000202
1982000202
1983000000
1984000000
1985000000
1986000325
198700014115
198800018119
19890009211
199000011314
19910005914
199200059095
19930003156159
199400214464480
19950009425434
199600012472484
19970008226234
19980003228231
199900085361
20000009367376
200100010198208
200200014316330
200300012140152
200400011314325
2005000174461
200600017123140
200700022128150
20080002697123
2009000331245
201000065118183
20110007059129
201200158187
201300114119134
201400078390
2015000808
2016000101
2017000000
2018000000
Total00446343414808