*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700020108110
1970002046
1971001078
1972001078
1973001089
1974002046
19750030710
19760020911
197700201214
19780010910
197900601521
198000201618
198100001515
198200601622
198300301215
198400501722
198500401519
198602702130
1987022201741
1988012101941
1989042902255
1990213211735
19916112111554
199238619114123
1993235115121390
199451259230191306
199541587124181625
199621234151141266
1997240613122444
1998267111125710
19991845117108
20002974201271024
2001465719130711
200201025431211090
2003079731120849
200421039320211094
2005215945228236
2006169766225791
2007071376030819
20082318105930464
2009374122022221
20101328200031560
20113297264046610
2012041875246541
2013133339803735
2014032321002535
201514380144
2016081009
201711100012
Total521387620133192516897