In the United States, from 2009 to 2018, Group of answer choices National health expenditures as a percentage of gross domestic product and per capita national expenditures increased. National health expenditures as a percent of gross domestic product remained relatively constant, while per capita national health expenditures increased. National health expenditures as a percentage of gross domestic product increased, while per capita national health expenditures remained relatively constant. National health expenditures as a percentage of gross domestic product and per capita national expenditures remained relatively constant