This video ranks the top 15 countries in the world by oil production from 1965 to 2018. Oil production is measured in barrels per day. In the worldwide oil industry, an oil barrel is defined as 42 US gallons, which is about 159 litres or 35 imperial gallons.br br br Datasources: br Music: Symphony no. 9 in Em, 'New World' - IV. Allegro con fuoco - Antonín Dvořákbr The Soviet National Anthem (1977 version) - choir and orchestra of Bolshoi Theatrebr National Anthem of Russia - Presidential Orchestra - attribute www.kremlin.rubr The Star Spangled Banner - Band Only - The U.S.