Despite a bounce in home prices during the first half of 2010, Fiserv Inc. says it expects property values nationally to fall another 7.1 percent over the next 12 months before beginning to stabilize at the end of 2011. The company sees double-dip territory ahead for many major markets, particularly those that saw the strongest appreciation during the spring and summer months of this year. The analysts at Standard & Poor's have released a similar forecast for the path of home prices. They anticipate an additional 7 percent to 10 percent drop through 2011.