*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700020155157
1970001045
197100001010
1972001078
1973001089
1974002079
19750120912
197600301417
197700401620
197800301417
197900601925
198001801726
198100601925
198200402226
198300202123
198400202022
198501301923
1986011202639
1987052302755
1988031302339
1989042502655
1990133712264
19917132312266
199236912222108
1993713326327196
1994522940030304
1995820726429274
1996429035123353
1997228119136339
1998832631129395
1999510318125152
2000641141137496
2001624840248344
2002245775145580
2003342651228510
2004245037028517
2005119570240308
20063271146237459
20071366136538546
20081265174938487
20095145220038408
20103278331150663
20110112469181663
201212231867119536
20130228254314499
201413137621393
201504780486
201603300336
2017014005
Total856096277853139710409