In a recent survey, 62 percent of homeowners believed their home’s value had increased or stayed the same over the last year. But a preliminary analysis of market data indicates that more than 75 percent of U.S. homes have actually declined in value, according to a release from Zillow Inc., which conducted the research.

The survey, which included 1,361 homeowners nationwide, also found strong optimism among homeowners; they believe their houses will continue to increase or stay the same in value over the next six months.

According to the data, nearly 75 percent of homeowners believe their home value will increase or stay the same, with only 25 percent expecting a decrease in value.

This however, doesn’t seem likely given recent market data, which show only 19 percent of homes actually increased in value in the year past and just 5 percent remained the same in value.

When broken down by market, the research reveals that 39 percent of Midwest homeowners believe their home has increased in value, and another 22 percent believe their home has retained its value. Only 39 percent of homeowners believe their home’s value has decreased.

The Midwest data is in contrast to the data compiled for the West, where only 16 percent of homeowners believe their homes have decreased in value, more than 55 percent believe their home’s value has stayed the same, and only 28 percent believe their home has increased in value.