The primary mortgage program used by the Federal Home Loan Banks racked up less than stellar numbers for 2004, just as lawmakers are beginning to debate the role the 12 Banks should play in the residential mortgage market. The Mortgage Partnership Finance program, run by the FHLBank of Chicago, posted a huge 74.5 percent drop in new business in 2004. Chicago officials reported last week that the program only funded $18.4 billion – just above…