6. FINANCIALASSETS AND LIABILITIES AT FAIR VALUE THROUGH PROFIT OR LOSS  (Concluded)  Chunghwa entered into investment management agreements with well-known financial institutions (fund  managers) to manage its investment portfolios in 2006. The investment portfolios managed by these fund  managers aggregated to an original amount of US$100 million. Chunghwa terminated the investment  management agreements on March 2, 2009 and asked fund managers to dispose of all the investment  portfolios. The fund managers had disposed of all investment portfolios before June 23, 2009 and returned  the proceeds to Chunghwa.  The Company entered into currency swap contracts and forward exchange contracts to reduce its exposure  to foreign currency risk and variability in operating results due to fluctuations in exchange rates. However,  the aforementioned derivatives did not meet the criteria for hedge accounting and were classified as financial  assets or financial liabilities held for trading.  December 31 2009 2010 NT$ NT$ (In Millions) Cash equivalents Commercial paper, annual yield rate - ranging from 0.19%-0.24%  and 0.41%-0.48% for 2009 and 2010, respectively $  1,568  $  26,550  Treasury bills, annual yield rate - ranging from 0.42%-0.43% —  2,888  1,568  29,438  $  73,259  $  90,875  December 31 2009 2010 NT$ NT$ (In Millions) Derivatives - financial assets Currency swap contracts $  7  $  34  Forward exchange contracts —  —  7  34  Designated financial assets at fair value through profit or loss Convertible bonds 34  43  $  41  $  77  Derivatives - financial liabilities Forward exchange contracts $  1  $  —  F-28