pre_text: CREDIT RISK We are exposed to credit risk from operating activities and certain financing activities, the maximum exposure of which is represented by the carrying amounts reported in the statements of financial position. We are exposed to credit risk if counterparties to our trade receivables and derivative instruments are unable to meet their obligations. The concentration of credit risk from our customers is minimized because we have a large and diverse customer base. There was minimal credit risk relating to derivative instruments at December 31, 2019 and 2018. We deal with institutions that have investment-grade credit ratings, and as such we expect that they will be able to meet their obligations. We regularly monitor our credit risk and credit exposure. The following table provides the change in allowance for doubtful accounts for trade receivables.
table: NOTE 2019 2018
table: Balance, January 1 (51) (54)
table: Adoption of IFRS 9 – (4)
table: Additions (114) (84)
table: Usage 103 91
table: Balance, December 31 10 (62) (51)
question: Analyse this data from a financial earnings document. What is the average amount of Usage in 2018 and 2019?