This means that it takes them much longer to collect their debts on this credit. This lower figure may mean that the Big 5's collection process has deteriorated or that their products have been sold to customers with financial difficulties. The overall days outstanding ratio increased by 48.39% over the 10-year period. They achieved an average DSO (Day Sales Outstanding) of 2.6x in 2005 and 4.3x on average in 2014. This means that it takes them on average almost 2 extra days to collect their accounts.