*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000000
1971000000
1972000000
1973000000
1974020002
1975020002
1976002002
1977002002
1978000000
1979062008
1980045009
1981012003
1982002002
1983012003
1984001001
1985001001
1986010001
1987041005
1988013004
198901410015
199001210013
1991051006
19920740011
199302220024
199416760074
199521580025
199623050037
19971131800140
199818450090
1999170120083
20000194600200
20010132500137
20020213900222
200332071200222
200402462400270
200521551100168
200614442800473
200713141500330
200812412000262
200902206000280
201034813300517
201113894800438
201208461100857
201302522000272
201402531100264
201501380021
201602170028
201708510086
2018000000
Total205185405005610