TALLINN. Sept 28 (Interfax/BNS) - Estonia's GDP increased 5% year- on-year in the second quarter of 2001, according to finalized figures, the statistics department reported. Preliminary estimates put GDP growth at 5.2% in the second quarter. Experts predicted GDP growth at 4.5%-5.5% in April-June. Estonia's GDP increased 5.8% year-on-year in the first quarter.