DES MOINES — Iowa’s economy grew faster in 2020’s fourth quarter of 2020 and its pandemic-related losses were less severe than in many other states, according to a preliminary report on gross domestic product from the federal Bureau of Economic Analysis.The real GDP increased in all 50 states and Washington, D.C., in the last quarter of 2020, from 1.2 percent in Washington, D.C., to 9.9 percent in South Dakota.