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(Dollars in millions),"Year Ended December 31,.2021","Year Ended December 31,.2020","Year Ended December 31,.2019",2021 vs. 2020 Change.$,2021 vs. 2020 Change.%,2020 vs. 2019 Change.$,2020 vs. 2019 Change.%
Research and development,"$ 2,593","$ 1,491","$ 1,343","$ 1,102",74%,$ 148,11%
As a percentage of revenues,5%,5%,5%,,,,
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