Czech economic growth slowed in the second quarter, in line with market expectations, with gross domestic product (GDP) up 2.4% year on year (y/y) against a 2.8% y/y growth in the first quarter, the Czech Statistical Office (ČSÚ) said in a flash estimate published on Tuesday. The stable source for the GDP growth is still external trade, however, its positive contribution to enhance the economy performance is gradually decreasing,” the ČSÚ said.