pre_text: 18. Geographic Information Revenue by geography is based on the customer's billing address, and was as follows: No individual international country represented more than 10% of total revenue in any period presented.
table: Year Ended December 31,
table: 2019 2018 2017
table: U.S. $1,979.6 $1,723.9 1,504.5
table: International 1,008.5 936.2 727.4
table: $2,988.1 $2,660.1 $2,231.9
question: Analyse this data from a financial earnings document. What is the change in the average U.S. revenue between 2017-2018 and 2018-2019?