The data do not take account of those who were registered for supplementary pension plans via tacit consent (whose number is not yet available). To make sure that future pensioners have adequate incomes, it is necessary to continue the efforts to increase the proportion of workers signing up.
In the same vein, I also do not buy the opposing argument that I hear from time to time, namely that rushing into the euro would solve all the problems experienced by the central and eastern European countries.