WASHINGTON D.C. --- The U.S. average retail price for regular gasoline this week dropped another 8.0 cents to 229.6 cents per gallon, falling for the sixth straight week. Nonetheless, this price was still 32.7 cents higher than this time last year, according to a report from the Energy Department's Energy Information Administration (EIA). Over the past six weeks, retail prices have dropped a total of 63.2 cents per gallon. Prices were down throughout the country, with the Rocky Mountain region seeing the largest regional decrease of 11.7 cents to 234.7 cents per gallon. The Midwest had the lowest regional price in the country, falling 5.3 cents to 217.8 cents per gallon, the EIA reported. East Coast prices fell by 10.1 cents to 229.5 cents per gallon. The West Coast averaged 254.7 cents per gallon -- the highest regional average price in the country, after falling 7.6 cents. California prices lost 7.7 cents to 258.2 cents per gallon. Retail diesel fuel prices lost another 9.6 cents to reach 260.2 cents per gallon, the lowest price since August 29, 2005, the EIA said. Over the past three weeks, the U.S. average retail diesel price has dipped 55.5 cents per gallon. Retail diesel fuel prices were down throughout the country, the EIA said. But the Rocky Mountains saw the largest regional decrease of 14.1 cents to 276.6 cents per gallon. That still represents the highest regional average price in the country. East Coast prices were down 9.2 cents to 256.5 cents per gallon, the lowest regional price in the nation. West Coast prices averaged 273.8 cents per gallon after falling 8.3 cents.