According to Melanie Cressman, Marketing Communications Manager at the synthetic wine bottle closure company Vinventions, in 1999 synthetic was about 2% of the wine bottle closure market, screw cap was at 3%, one-piece natural cork was about 34% and technical (composite) cork made up 61%.
Want to know what the universal preferred closure is? Read the numbers in this article from Forbes.
The Grape Geeks 