The South Korean won has fallen nearly 6 percent against the US dollar this year, central bank data showed Sunday, as foreign investors sold off more than 156 trillion won ($102.3 billion) worth of domestic stocks. The average exchange rate stood at 1,484.56 won per dollar during the first half of the year, according to the Bank of Korea's Economic Statistics System. It marked the second-highest first-half average on record, behind 1,493.08 won in the first half of 1998 during the Asian financia