Norway welcomes foreign investment as a matter of policy and generally grants national treatment to foreign investors. According to the OECD's (Organization for Economic Cooperation and Development) 2013 FDI Regulatory Restrictiveness Index, Norway is ranked close to the OECD average (slightly less restrictive than the United States). Norwegian authorities encourage foreign investment particularly in the key offshore petroleum sector, mainland industry, and in less developed regions such as northern Norway. In 2013, the Government established "Invest in Norway", Norway's official investment promotion agency, to help attract and assist foreign investors.