*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 19700010114115
1970000044
197100001010
1972000077
1973000077
1974001067
1975000066
19760010910
197700101011
1978000099
197900101112
198000101011
198100001414
198200301518
1983002079
198400301013
1985000077
198601201821
1987021502138
1988021402036
1989062101845
1990122001437
199113701223
199214201623
19932131701951
19941531802092
19953111221745
1996142121965
1997229122020173
1998445135015199
1999030131015176
2000135158024218
200105118021144
20020110508114
2003011124013148
200403138020161
200513128019151
200634237015259
200707160124192
20082494116117
2009024118014156
201038194017222
201108124020152
20120121732254
2013037121490
201427741084
201511410447
2016002013
2017003003
Total293992428117423609