Bohrium Ionization Energy

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

There is no data about Bohrium ionization energy