However , the proportion of vinifera grapes used in wine -- making is increasing .
Of 100,000 short tons of grapes produced in 2005 , only 4,600 tons were used for wine - making .
The proportion of vinifera grapes used in wine -- making is increasing .
Of 100,000 short tons of grapes produced in 2005 , only 4,600 tons were used for wine - making .