*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100304
1970000404
1971100001
1972200002
1973000000
1974100001
1975000000
1976000101
1977100102
1978100304
1979000426
1980001416
1981100416
1982100304
1983000202
1984200204
1985000202
1986000415
19871009313
19880007310
198930010720
199010071725
199110411925
1992111102538
1993100135165
199410119122143
199500222108132
199620117114134
199710125140167
199800119148168
199900113111125
200020124153180
200130219136160
200220035250287
200320032342376
200400124350375
200510328216248
200600051355406
200700048342390
200830153291348
200900183184268
2010002102340444
2011101112133247
201200234283319
201300080343423
2014001105599705
2015000281745
2016000202
2017000101
2018000000
Total37128108051976343