Countrywide Financial became a dominant force in the non-agency MBS market in 2004, growing its production volume about twice as fast as the overall market and claiming a hefty 13.7 market share in a highly fragmented business. According to a new ranking by Inside MBS & ABS, Countrywide issued a total of $118.3 billion in non-agency MBS last year, spanning the entire spectrum of the market. That was almost exactly double the amount of business…