Rutherfordium Ionization Energy

The Rutherfordium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Rutherfordium.
Rf -> Rf⁺ + e^-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Rutherfordium is:
Rf^N+ -> Rf^(N+1)+ + e^-

There is no data about Rutherfordium ionization energy