SAN SALVADOR, El Salvador--(BUSINESS WIRE)--As GDP in Central America stabilizes at lower rates, Fitch Ratings expects loan growth for most countries in the region to slow in the latter half of 2015. So far this year, retail loans in the region have gradually increased their share as banks seek wider margins and greater diversification. However, corporate lending continues to be the main driver of portfolio expansion. 'El Salvador and the Dominican Republic are leading the way in the retail seg