ANKARA The construction cost index rose by 22.69 percent year-on-year in April, marking the lowest annual increase recorded in the past four and a half years. The headline cost index advanced 1.67 percent monthly, according to data from the Turkish Statistical Institute (TÜİK). The sub-index of labor costs rose by 1.1 percent month-on-month, which brought the annual increase to 31.8 percent. Material costs in the construction sector increased by 2 percent monthly and 18 percent annually. The