In the highlighted sentence below, I use two sources. the first source related to the "nine million" blackouts fact and the second source relates to the "700 excess deaths" fact. Should I use two footnotes (i.e. one after "nine million" and one at the end of the sentence), or should I put one footnote at the end like the "9" is here and list the 2 citations separated by a semi-colon? (support with Bluebook rules please)

DJ transmission, and the power grid failed. The failure resulted in blackouts to nine million Texans and close to 700 excess deaths over the same time period of the previous year." After the storm, fifty-two percent of Texans