MADRID--Spain's unemployment rate breached 20% in the first quarter as the country's ailing economy, reeling from the collapse of a decade-long construction boom, continued to shed jobs, Spain's National Statistics Institute said Friday. The INE said first-quarter unemployment rose to 20.05% from 18.83% in the fourth quarter of last year, confirming leaked data published by a Spanish newspaper earlier this week. Spain's first-quarter unemployment rate is the highest in the developed world, Spain's highest since 1997 and it surpasses the government's predictions, which forecast a 19% unemployment rate at the end of this year.