(Decanter) - The Prosecco region estimates it will grow to almost five times its current size by 2035. The Italian sparkling wine producing region forecasts production volumes will reach one billion bottles within the next 25 years, according to figures revealed at Hong Kong's Wine Future conference. The region currently produces 220m bottles each year. Gianluca Bisol, managing director of Bisol, estimates the Prosecco-producing regions of Veneto and Friuli will need to invest around €1.8bn (£1.5bn) to finance this expansion.