*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100517
1970000303
1971000101
1972000101
1973000101
1974000101
1975000213
1976000303
1977200709
1978000404
19790019010
1980001506
1981000404
1982000404
1983000606
1984000808
1985001203
19860008210
198700011415
1988000628
198900116623
199000711725
19910015251353
19920013242966
1993002127105153
1994001835300353
1995301035223271
1996001132199242
199720330132167
199800731239277
19990032290115
2000101041313365
200100527126158
200210646245298
200300830226264
2004001435408457
200500754117178
2006108132359500
200700983204296
2008003119110232
2009004164140308
2010009214134357
2011005208107320
201200642120168
20130011237114362
2014003124131258
2015002681383
201600213823
2017000000
2018000000
Total110224201642286479