Between 1980 and 2015, the share who married someone of a different race or ethnicity more than tripled from 5% to 18%. As of 2015, 39% of U.S.-born Hispanic newlyweds and almost half (46%) of U.S.-born Asian newlyweds had a spouse of a different race or ethnicity. (Go here.)
As of 2020, Among married Millennials (1981-1996), 8% of whites are married to someone of a different race or ethnicity. The shares are higher among Hispanic (19%), black (18%) and Asian (16%) Millennials. Intermarriage rates are higher for Millennials than for Gen Xers (1965- 1980) across all racial and ethnic groups. (Go here).
Census Bureau note dated 2018 here.