FDI is a means to supplement domestic investment for achieving higher level of economic development and providing opportunities for technological upgradation as well as access to global managerial skills and practices. With India allowing FDI up to 100% in many sectors, power, petroleum and natural gas, services, construction and real estate have emerged as the preferred destinations for foreign investors, who have pumped in $20.8 billion in these areas in the last four years. The real estate sector which was thrown open in 2004-05 saw FDI picking up slowly in the initial two years, but grew substantially in 2007-08 to $2.17 billion. The government has eased FDI norms for a host of sectors, but has kept areas such as retail, (except single brand retailing), atomic energy, lottery, gambling and betting, business of chit fund and trading in Transferable Development Rights (TDRs) out of the ambit of foreign investors.It had allowed 100% FDI in sectors such as titanium mining, maintenance, repair and overhauling facilities for aircraft.