Despite the current economic crisis, mortgage rates have dropped significantly since the Federal Reserve recently unveiled a plan to buy up to $500 billion of mortgage securities backed by government-sponsored enterprises Fannie Mae , Freddie Mac and Ginnie Mae. “Any buyer that has decent credit, it’s a great time to buy,” said Denise Whipp, general manager of Coldwell Banker Phil Mathyer Real Estate in Warren. According to a report in The Wall Street Journal, since the initial announcement of the plan, 30-year fixed mortgage rates have fallen from above 6 percent to just above 5 percent. Freddie Mac’s weekly survey showed the rate averaged 5.10 percent for the week ending Dec. 31, down from 5.14 percent a week ago and 6.07 percent a year ago. In the same report, rates on 15-year fixed mortgages also fell, averaging 4.83 percent, and five-year Treasury-indexed hybrid adjustable rate mortgages averaged 5.57 percent. People are “still buying,” said Jim Cheronis, assistant manage