Around 3.8 million people work in Switzerland; about 25% of employees belonged to a trade union in 2004. Switzerland has a more flexible job market than neighbouring countries and the unemployment rate is very low. The unemployment rate increased from a low of 1.7% in June 2000 to a peak of 4.4% in December 2009. The unemployment rate is 3.2% in 2014. Population growth from net immigration is quite high, at 0.52% of population in 2004. The foreign citizen population was 21.8% in 2004, about the same as in Australia. GDP per hour worked is the world's 16th highest, at 49.46 international dollars in 2012.