The following are international rankings of Saudi Arabia. Cities Riyadh Metropolitan area by population Most expensive cities Communications The World Factbook: Second number of mobile phones in use ranked OECD: number of broadband Internet users ranked Economist Intelligence Unit: e-readiness 2008 ranked out of 70 countries The second position among G20 countries for telecoms expansion Demographics United Nations: Population ranked out of 221 countries Population density ranked out of 241 countries United Nations report World Population Policies 2005, Number of immigrants ranked out of 192 countries Economy United Nations: Human Development Index, ranked out of 177 countries Nominal GDP growth rate: ranked out of 215 countries Nominal GDP: ranked13 out of 179 countries ($ IMF; $ World Bank; $ CIA) Nominal GDP per capita 2006, ranked out of 179 IMF; out of 170 World Bank; out of 185 CIA A.T. Kearney/Foreign Policy Magazine: Globalization Index 2006, ranked out of 62 countries The Wall Street Journal: 2006 Index of Economic Freedom, ranked out of 155 countries The Economist: Worldwide Quality-of-life Index, 2005, ranked out of 111 countries World Economic Forum: Global Competitiveness Index 2006-2007, ranked 24 out of 125 countries World Tourism Organization World Tourism rankings ranked out of all countries World Economic Forum: Travel and Tourism Competitiveness Report 2008, ranked out of 130 countries Education According to ARWU 1 King Abdulaziz University 101-150 2 King Saud University 151-200 3 King Abdullah University of Science and Technology 201-300 4 King Fahd University of Petroleum & Minerals 401-500 Energy Oil The World Factbook: oil imports 2007, ranked 73 out of 207 countries The World Factbook: oil consumption 2009, ranked 9 out of 207 countries The World Factbook: oil exports 2007, ranked 1 out of 209 countries The World Factbook: oil production 2009, ranked 2 out of 208 countries The World Factbook: proven oil reserves 2010, ranked 1 out of 204 countries Natural gas The World Factbook: natural gas imports 2008, ranked 135 out of 204 countries The World Factbook: natural gas consumption 2009, ranked 11 out of 209 countries The World Factbook: natural gas exports 208, ranked 130 out of 205 countries The World Factbook: natural gas production 2009, ranked 11 out of 207 countries The World Factbook: natural gas proven reserves 2010, ranked 5 out of 205 countries Environment Yale University Center for Environmental Law and Policy and Columbia University Center for International Earth Science Information Network: Environmental Sustainability Index, ranked