Dairy major, Gujarat Co-operative Milk Marketing Federation, which sells milk and other dairy products under the Amul brand, has reported a 14 per cent year-on-year rise in its turnover, at Rs. 20,730 crore for the 2014-15 fiscal.Growth in its consumer products segment was 21 percent.The cooperative's revenues have now climbed by over 50 per cent in the last two financial years.