Freddie Mac’s total mortgage portfolio increased at an annualized rate of 9 percent in December 2017, according to a new report. Mortgage-related securities and other mortgage-related guarantees increased at an annualized rate of 9.8 percent in December.

Single-family refinance-loan purchase and guarantee volume was $13.7 billion in December, representing 44 percent of total single-family mortgage portfolio purchases and issuances. Relief refinance mortgages comprised approximately 4 percent of our total refinance volume during December.

The aggregate unpaid principal balance of our mortgage-related investments portfolio decreased by approximately $600 million in December.

Other highlights from the report:

• The single-family seriously delinquent rate increased from 95 basis points in November to 108 basis points in December. The multifamily delinquency rate remained flat at 2 basis points in December.
• The measure of Freddie Mac’s exposure to changes in portfolio market value averaged $14 million in December. Duration gap averaged 0 months.