Historical Futures Prices: SGX FTSE China A50 Index Futures, December 2016 (CNZ2016), December 2016. SGX China A50 Index Futures is the world’s only offshore futures tracking the A-share market, enabling efficient access into the Chinese growth engine. Tracking the performance of the largest 50 ‘A’ shares companies in China, the underlying FTSE China A50 Index is highly correlated with the domestic Chinese market. Contract Size: US$ 1 x SGX FTSE China A50 Index Futures Price. Minimum Price Fluctuation: 5 index point (US$5).