The rotation system in the ECB Governing Council is an arrangement which, under certain circumstances, revokes the principle that each member state of the monetary union has one vote on all decisions in the ECB Governing Council. The rotation system replaces this principle. It came into force after 19 countries had joined the monetary union. Under this system, the central banks are divided into two groups depending on the economic power and size of the financial sector in their home countries. The five "stronger states" (including Germany) jointly receive four votes, which rotate on a monthly basis. The second group, comprising 14 or more countries, receives eleven voting rights, which also rotate monthly. Only the six members of the ECB Executive Board permanently retain their voting rights. Once the rotation system is applied, the president of the Deutsche Bundesbank will have no voting rights in the ECB Governing Council in every fifth month, for example, but he will be able to participate in meetings and discussions. The intended effect of the rotation system is for the larger member states to retain a certain quantitative weighting in votes even after many smaller states join the monetary union. Once there are 22 member states, three groups will be formed, with the first group remaining unchanged. The second group, comprising half of all the states, will then receive eight votes and the third group, with the smallest states, will receive three voting rights.