Central Asia. During the past decade since 2001, the Turkish lira has also gained a considerable amount of value and maintained its stability, becoming an internationally exchangeable currency once again (in line with the inflation that dropped to single-digit figures since 2003.) The economy grew at an average rate of 7.8% between 2002 and 2005. Fiscal deficit is benefiting (though in a small amount) from large industrial privatizations. Banking came under stress beginning in October 2008 as Turkish banking authorities warned state-run banks against the pullback of loans from the larger financial sectors. More than 34% of the assets in the Turkish banking sector are concentrated in the Agricultural Bank (Ziraat Bankası), Housing Bank (Yapı Kredi Bankası), Isbank (Türkiye İş Bankası) and Akbank. The five big state-owned banks were restructured in 2001. Political involvement was minimized and loaning policies were changed. There are also numerous international banks, which have branches in Turkey. A number of Arabian trading banks, which practice an Islamic banking, are also present in the country. Government regulations passed in 1929 required all insurance companies to reinsure 30% of each policy with the Millî Reasürans T.A.Ş. (National Reinsurance Corporation) which was founded on 26 February 1929. In 1954, life insurance was exempted from this requirement. The insurance market is officially regulated through the Ministry of Commerce. After years of low levels of foreign direct investment (FDI), in 2007 Turkey succeeded in attracting $21.9 billion in FDI and is expected to attract a higher figure in following years. A series of large privatizations, the stability fostered by the start of Turkey's EU accession negotiations, strong and stable growth, and structural changes in the banking, retail, and telecommunications sectors have all contributed to the rise in foreign investment. In recent years, the chronically high inflation has been brought under control and this has led to the launch of a new currency, the "New Turkish lira", on 1 January 2005, to cement the acquisition of the economic reforms and erase the vestiges of an unstable economy. On 1 January 2009, the New Turkish lira was renamed once again as the "Turkish lira", with the introduction of new banknotes and coins. Medical tourism There are numerous private hospitals in Turkey, which has benefited from medical tourism in recent years. Health tourism generated revenues worth $1 billion in 2019 for Turkey's economy. A total of 662,087 patients were treated at Turkish hospitals