  With the help of a recently developed non-equilibrium approach, we
investigate the ionic strength dependence of the Hubbard--Onsager dielectric
decrement. We compute the depolarization of water molecules caused by the
motion of ions in sodium chloride solutions from the dilute regime (0.035 M) up
close to the saturation concentration (4.24 M), and find that the kinetic
decrement displays a strong nonmonotonic behavior, in contrast to the
prediction of available models. We introduce a phenomenological modification of
the Hubbard--Onsager continuum theory, that takes into account the screening
due to the ionic cloud at mean field level, and, is able to describe the
kinetic decrement at high concentrations including the presence of a pronounced
minimum.
