*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700050121126
1970000033
1971000099
1972000066
1973001078
1974001078
1975002079
197600301013
19770050914
197800101011
197903401219
198000101213
198101201518
198201301519
198300201315
198400001414
198500301114
198600901524
1987041002135
1988041201935
198907701731
1990235901460
19916161601452
19922411501169
199329515014126
1994527632021334
1995220022219245
1996434018016378
1997423526027292
1998040824022454
1999022019019258
2000444633028511
2001157225027625
2002046450016530
2003185752122933
2004063925023687
2005044054127522
2006236595022484
20070346102322473
20080284126717434
200909716507269
20104132255012403
2011167287016371
20120118116137272
201321937835281
20140674120110
2015021330054
2016115220038
2017000000
Total4370091826208119709