*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197010160219
1970000000
1971000011
1972001001
1973000011
1974002002
1975000000
1976000000
1977001001
1978004004
1979001001
1980001001
1981000000
1982000022
1983001001
1984014005
1985112004
1986023027
1987113005
1988011024
19890290213
19900270110
199134110220
199212110014
19934370216
199442100117
19950390214
199621110115
199702210225
199824130120
199922150221
200021100518
200141140221
200224140020
20036470320
200422120521
200502150320
200653130324
20072560316
200801130216
20096380118
2010610160133
201155230437
201233160527
2013125301268
2014163201251
201582410657
201642570467
201742400854
2018234601667
201942556015100
202002200527
2021014005
2022000000
Total8812268001411031