Despite a slowdown during its final lap, 2017 was a strong year for sales of agency mortgage servicing rights, according to a new analysis of mortgage-backed securities data by Inside Mortgage Trends.The market saw some $538.49 billion of agency servicing rights change hands last year, a 22.0 percent increase from 2016. Most of the MSR transfers were bulk transactions, which totaled $406.78 billion, a huge 51.1 percent jump from the previous year. Bulk deals ... [Includes three data charts]