NEW YORK (Reuters) - Markets revenue at JPMorgan Chase & Co <JPM.N> has been down about 15 percent so far in the second quarter from a year earlier, Chief Financial Officer Marianne Lake said on Wednesday.

Speaking at an investor conference, Lake said the decline stemmed from lower volatility compared with a year ago when the United Kingdom was preparing to vote on Brexit.

Lake added that U.S. economic growth this year is "solid, not stellar," as optimism continues for pro-growth policies in Washington despite the lack of significant changes in regulations and taxes.

(Reporting by David Henry in New York; Editing by Chizu Nomiyama)