*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197015001016
1970200002
1971500106
1972400105
1973300104
1974300104
1975200103
1976600208
19778005013
1978400105
1979500207
19805005010
19819001010
198210004014
1983600309
19847012010
19858003011
19867017116
198790010019
1988160120138
198990013123
1990120017029
199160130643
1992130215232
199370128036
1994140037354
1995130143360
1996130134351
1997170225246
1998120238254
1999110018029
2000180036155
2001170134052
2002100034044
2003130141257
2004180026044
2005250015040
2006230025048
2007201036057
2008161031149
2009100050464
201061265276
201113111280143
2012141028144
201330030336
201410018625
201520014016
2016200103
2017200204
2018000000
Total474518983441524