Import duties make up approximately 60% of government revenues. Import levies range from 1% to 260% and average 35%, but are subject to change quite frequently. Most duties are applied ad valorem; preferential rates apply to imports from Commonwealth countries. Exemptions are available for many basic commodities. Luxury goods are taxed at separate tariff rates, for example: cigarettes are taxed at 210% with a stamp tax of 7%, pool tables at 100%, bottled water at 70%, automobiles from 45% to 75%, and air conditioners at 35%.