Refinancings make up a smaller portion of the mortgage business than at any time in the past two decades, posing a challenge for lenders who already fear higher interest rates and climbing house prices could eventually depress purchase activity, the Wall Street Journal reported. Last year, 37 percent of mortgage-origination volume was because of refinancings, according to industry research group Inside Mortgage Finance. That is the smallest proportion since 1995, and the number of refinancings is widely expected to shrink again this year. In 2012, refinancings were 72 percent of originations. While purchase activity has climbed steadily from a post-financial-crisis nadir in 2011, growth in 2017 wasn’t enough to offset a $366 billion decline in refinancing activity. The result: The overall mortgage market fell around 12 percent, to $1.8 trillion, according to Inside Mortgage Finance.