1. Qatar — 14.72, Luxembourg — 12.79, United Arab Emirates — 8.95, Bahrain — 8.66, Trinidad and Tobago — 8.23, Canada — 8.08, Mongolia — 8.05, United States — 8.04, Kuwait — 8.03, Oman — 7.29
2. Russia, United States, Saudi Arabia, Canada, Iran, China, Brazil, Australia, Iraq, Venezuela
3. Oil is used up first at the current rate because Oil is mostly used as fossil fuel by humans. And many by-products are formed by Oil. The fossil fuel resource is limited in amount, so due to the continuous use of these fuels, it will be no more exist in the earth's crust