*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970012003
1970004015
1971001001
1972001001
1973002002
1974001001
1975003003
1976004004
1977005005
1978012003
1979007007
1980017008
1981014005
19820180110
1983003003
1984008008
1985012003
198602100012
198703210024
198802240026
1989012390051
1990224110037
1991712160035
199241861900209
199335542200579
19943179442001839
199510153329001572
19965147222001499
199706822000702
199809251900944
199912312000252
20004130031001335
2001298432001018
20021137638001415
20032133940001381
20041177135001807
200553393900383
20061100592001098
200711075111001187
2008153412100656
2009232513800465
20106736259001001
2011043227000702
201236624200707
201316791207001014
201411017155001173
201518370046
201601980027
2017011002
Total822115220340223270