Italy's population was expected to fall precipitously; now it is predicted to stay flat.
The study for the US Air Force by Leon Perkowski in 2006 found that there were at least 15 million Muslims in the EU, and possibly as many as 23 million. According to the US's Migration Policy Institute, residents of Muslim faith will account for more than 20 per cent of the EU population by 2050 but already do so in a number of cities.
Jerome Vignon, the director for employment and social affairs at the European Commission, said that the focus of those running the EU had been on asylum seekers and the control of migration rather than the integration of those already in the bloc.
But Karoly Lorant, a Hungarian economist who wrote a paper for the European Parliament, calculates that Muslims already make up 25 per cent of the population in Marseilles and Rotterdam, 20 per cent in Malmo, 15 per cent in Brussels and Birmingham and 10 per cent in London, Paris and Copenhagen.
Britain is expected to become the most populous EU country by 2060, with 77 million inhabitants.
Right now it has 20 million fewer people than Germany.
Europeans often tell pollsters that they have had enough immigration, but politicians largely avoid debate.
France banned the wearing of the hijab veil in schools and stopped the wearing of large crosses and the yarmulke too, so making it harder to argue that the law was aimed solely at Muslims.