California remained the dominant housing market in the U.S., accounting for 24.4 percent of all mortgage originations reported under the Home Mortgage Disclosure Act. But the Golden State also posted a significantly slower-than-average 11.0 percent growth rate in 2003. The fastest-growing major mortgage markets last year were Florida, New York, Texas and New Jersey, according to a new 2003 HMDA analysis by Geosegment Systems. All these top-10 states posted year-to-year gains of 25 percent or more,…