Greek stocks fell almost 2.5 percent yesterday, in line with retreating European bourses. The Athens Exchange (ATHEX) benchmark general index gave up 2.43 percent to end at 3,290.74 points. National Bank, the country’s largest lender, slumped more than 5 percent while Bank of Cyprus and Marfin Popular Bank also shed more than 3 percent. The FTSE/ATHEX 20 blue chip index fell 2.81 percent and the FTSE/ATHEX 40 index of mid-caps slipped 1.47 percent. It was the sixth straight week in which the Athens bourse ended in the red. Losers beat winners 155 to 58 with 59 shares unchanged. Turnover rose to 214 million euros from 198 million euros in the previous session.