17 1. See appendix for a reconciliation of GAAP Gross Profit to non - GAAP Gross Profit Non - GAAP Gross Profit (1) US$M Non - GAAP Gross Profit $124 $177 $250 $289 2017 2018 2019 TTM 74% 76% Non - GAAP Gross Margin (%): 79% 81%