*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000314
1970000303
1971000000
1972000000
1973000000
1974000101
1975000202
1976000202
1977000404
1978000213
1979000303
1980001517
1981000314
1982000415
1983000101
1984000303
1985000202
1986000415
19870018211
1988001416
19890035614
199000262533
199110951126
1992107161842
19930015135987
199400428190222
199500101696122
199600614147167
199710518264288
199800511178194
199900312189204
2000001123258292
200110723226257
200200234325361
200300634524564
200400322825850
200500445386435
200600693367466
200700985451545
200800675587668
20090013119320452
20100016181397594
2011004206185395
201200272322396
201300349354406
201400443751798
2015002341551
201600113418
2017001001
2018000000
Total40172134974899014