Greece has a mixed capitalist economy with the public sector accounting for half of GDP and with per capita GDP 70% of the leading euro-zone economies. Tourism provides 15% of GDP. Immigrants make up nearly one-fifth of the work force, mainly in menial jobs. Greece is a major beneficiary of EU aid, equal to about 3.3% of GDP. The Greek economy grew by 4.0% in 2003 and is expected to grow by 4.2% in 2004, the year that Athens will host the 2004 Olympic Games. Remaining challenges include the reduction of the public debt, inflation, and unemployment; and further restructuring of the economy, including privatizing several state enterprises, undertaking pension and other reforms, and minimizing bureaucratic inefficiencies.