This article leaves important questions unanswered: It says the amount of money collected on delinquent student loans increased, but is that due to a policy ch

This article leaves important questions unanswered: It says the amount of money collected on delinquent student loans increased, but is that due to a policy change or due to tax cuts and improving economic conditions? The chart shows an increase in collections every year since 2014, with the largest increases in collections between 2014 and 2016, so it seems likely it's just an improving economy. But if there was a policy change, what changed?