Stocks continued their slide on the Greek bourse yesterday for the fifth day in a row, as fresh losses sustained by National Bank, whose shares reached a new 90-month low, affected the rest of the market. The Athens Exchange (ATHEX) general index closed at 1,440.64 points, falling 0.70 percent from Wednesday’s close at 1,450.81 points. The blue chip FTSE/ATHEX 20 index fell 1.01 percent to 678.07 points. ATEbank gave up 5.48 percent and National followed with a 3.92 percent drop to 6.37 euros. Marfin Investment Group rose 1.75 percent and OTE telecom climbed 1.35 percent. In total, 55 stocks moved up, 103 went down and 51 remained unchanged. Altec led the gainers with 20 percent growth, while Koumbas Holdings posted the biggest losses (down 16.67). Turnover came to just 64.9 million euros, down from Wednesday’s 109.1 million.