For each vintage, the CIVC rated the villages of the area based on the quality of their grapes and vineyards. The rating was then used to determine the price and the percentage of the price that growers get. The Grand Cru rated vineyards received 100 percent rating which entitled the grower to 100% of the price. Premier Crus were vineyards with 90–99% ratings while Deuxième Crus received 80–89% ratings. Under appellation rules, around 4,000 kilograms (8,800 pounds) of grapes can be pressed (wine) to create up to 673 gallons (US) (either 2,550 L or 3,060 L) of juice. The first 541 gallons (either 2,050 L or 2,460 L) are the cuvée and the next 132 gallons (either 500 L or 600 L) are the taille. Prior to 1992, a second taille of 44 gallons (either 167 L or 200 L) was previously allowed. For vintage Champagne, 100% of the grapes must come from that vintage year while non-vintage wine is a blend of vintages. Vintage champagne must spend a minimum of three years of aging. There are no regulations about how long it must spend on its Lees (fermentation), but some of the premier Champagne houses keep their wines on Lees (fermentation) for upwards of five to ten years. Non-vintage Champagne must spend a minimum of 15 months of aging but only a minimum of 12 months on the lees. Most of the Champagne houses keep their wines on the lees through the whole time of aging because it is more expense to bottle the wine then age it and finally shipped.. What requires more than 3 years of aging, vintage champagne or non-vintage champagne?