More American workers feel the economy is improving, but they are still in the minority, according to the Principal Financial Well-Being Index released Wednesday.

Des Moines-based Principal Financial Group Inc. hires Harris Interactive to conduct regular polls of Americans on financial issues. In this survey, 35 percent of American workers say their economic outlook is optimistic, up from 21 percent six months ago

Even so, in a separate response, 44 percent said they are still holding off on making major purchases such as a car or a home because of economic worries. The poll was conducted in late January.