sentences:  The top exports of Saudi Arabia are Crude Petroleum ($96.1B), Refined Petroleum ($13B), Ethylene Polymers($10.1B), Propylene Polymers ($4.93B) and Ethers ($3.6B), using the 1992 revision of the HS (Harmonized System) classification.Its top imports are Cars ($11.8B), Planes, Helicopters, and/or Spacecraft ($3.48B), Packaged Medicaments ($3.34B), Broadcasting Equipment ($3.27B) and Aircraft Parts ($2.18B)".In the year 2017, the Kingdom of Saudi Arabia was the United States of America's 20th ranked export market across the globe and ranked 21st in import markets.