Russia has a mixed economy, with enormous natural resources, particularly oil and natural gas. It has the world's eleventh-largest economy by nominal GDP and the sixth-largest by PPP. In 2017, the large service sector contributed to 62% of the total GDP, the industrial sector 32%, and the small agricultural sector roughly 5%. Russia has a low unemployment rate of 4.5%, and a relatively low poverty rate of 12.6%. More than 70% of its population is categorized as middle class officially. Russia's foreign exchange reserves are the world's worth $622 billion, and are the world's fifth-largest. It has a labour force of roughly 70 million, which is the world's sixth-largest. Russia's large automotive industry ranks as the world's tenth-largest by production.