18, and they're not all going to be ten-year intervals. Next round is actually the last one where ten years have passed; the rest will be five years.
Rate my PNLs! (updated 4/3/17)
http://www.behindthename.com/pnl/148673http://www.behindthename.com/pnl/148673/112996
Top-rated:
Violet,
Elizabeth,
Lily,
Cecily,
Charlotte;
Carson,
William,
Alexander,
Peter,
Colin