Annual Report 2017

137 Understanding is Baht 529.27 million (2016: Baht 544.19 million). As at 31 December 2017, debenture which had maturities over one year, coupon rate at 4.95% per annum (2016: 4.95% per annum) and market yields at 3.52% per annum (2016: at 4.15% per annum). Movements of long-term investments for the years ended 31 December 2017 and 2016 were as follows: Consolidated SET 2017 2016 2017 2016 Opening balance 8,312,060 9,263,105 8,312,060 9,263,105 Purchases 3,535,643 2,519,728 3,535,643 2,519,728 Disposals (3,676,658) (2,624,102) (3,676,658) (2,624,102) Classification of investments (Note 10) - (1,193,260) - (1,193,260) Unrealised gain on available-for-sale securities 307,223 346,589 307,223 346,589 Closing balance 8,478,268 8,312,060 8,478,268 8,312,060 (Unit: Baht’000) As at 31 December 2017 and 2016, held-to-maturity debt securities which were classified by maturity were as follows: Consolidated Due Within 1 year 1 to 5 years Over 5 years Total 31 December 2017 Held-to-maturity debt securities Debentures - 10,000 - 10,000 Deposits at banks - 887,540 529,269 1,416,809 - 897,540 529,269 1,426,809 31 December 2016 Held-to-maturity debt securities Debentures 10,000 10,000 - 20,000 Deposits at banks - 887,540 544,188 1,431,728 10,000 897,540 544,188 1,451,728 (Unit: Baht’000)