The trading volume of financial derivatives on the local bourse fell last year as demand for such tools declined amid a bearish run on the local stock market, data showed Thursday. The daily average trading volume of the derivatives, including futures and options, dropped 12.3 percent on-year in 2013 to 47.9 trillion won (US$45.6 billion), compared with 54.6 trillion won tallied a year earlier, according to the data compiled by the Korea Exchange (KRX).