On a day of high volatility, the Greek stock market saw considerable losses during the session yesterday but managed to recover and close with gains thanks to a positive performance by the bourse’s driving force, National Bank. The Athens Exchange (ATHEX) general index closed at 2,101.54 points yesterday, growing by 0.54 percent over Monday’s close at 2,090.29 points, although late in the afternoon it had fallen to as low as 2,003 points. The blue chip FTSE/ATHEX 20 index rose by 0.66 percent to end at 1,062.24 points. The biggest rise among blue chips was for Hellenic Postbank (up 5.41 percent), Intralot (3.89 percent), Hellenic Petroleum (3.18 percent) and National Bank (3.05 percent). Worst off were the stocks of Public Power Corporation (down 3.28 percent) and Hellaktor (3.02 percent). Turnover amounted to 265.9 million euros.