*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700040610
1970008008
1971000033
1972000011
1973000011
1974001001
1975104016
1976004048
19770080210
1978003003
197900110314
19801170312
19810080816
198200110516
1983003069
19840050611
19850040711
19860250310
19870280515
198810110416
1989011140934
1990140231772
1991220231349
199235300745
1993122400770
199438312409219
1995865106111191
199666113107205
199738751509614
1998681394010491
1999460370010444
2000447575018644
2001412570120607
200212171102735
20034539620151034
2004521712780131513
20053173603017796
20065729150161008
2007255852120930
20086202606111826
2009428454605839
2010535048203840
2011116640703577
20127330293010640
201329340700502
2014213431200448
20152396700108
201602230227
201714121018
2018000000
Total98279411496731214707