*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19701060040110
1970400105
1971900009
1972700007
1973500005
1974600107
1975500207
197611002013
197712005017
197811003014
197915006021
1980130020134
198118009027
198215009024
1983170015032
198416005021
198513002116
198617007125
198718007530
1988184010436
1989201010536
1990153162853
19911616131551
1992140218337
19931913141047
19942302294397
19951914351271
19961607373090
1997241429928356
1998260122235284
1999200120034255
2000310131727376
200123053517386
200215033552375
2003190844213482
20041802433142595
2005190229892411
2006250445018497
2007263037930438
20082210223761332
20092206149179356
20101700147162326
2011200121739277
20124310236136416
201392012960200
2014000762399
2015202221238
201630047151
2017000202
2018200002
Total8642867527812597496