Despite the much-vaunted turnaround plan dubbed Project Olympia, first-quarter figures from GM#;s German arm Opel yesterday showed its problems were intensifying, the newspaper Handelsblatt said. Opel sales for the first quarter of 2002 were down 24 percent to 78,000 cars in Germany and, since 1997, the company#;s share of its home market has declined from 18 percent to under 10 percent, the newspaper said.