Switzerland pays money as a contribution to various programmes in which they partake (for instance, the ERASMUS programme, the framework science programme, etcetera). In addition, it may have to pay for access to the internal market under the bilateral agreements and under the agreement between the European Free Trade Association and the EU.

I didn't find any precise figures (curiously enough) but I think it is between 300 million and 600 million a year. Switzerland recently agreed to pay an extra 125 million a year to support Eastern Europe.

Nanne, Thanks for the answer.
In the meantime  I have  read that Norway also pays signifaicant amount of Money to the EU.

La répartie est dans l'escalier. Elle revient de suite.