YPF , however , remained profitable throughout Repsol 's tenure even as output fell .
Net income from 1999 to 2011 at YPF totaled nearly US $16.5 billion .
YPF , however , remained profitable throughout Repsol 's tenure even as output fell , and net income from 1999 to 2011 at YPF totaled nearly US $16.5 billion .