This is more or less obvious given that the top 10 grossing movies in 2019 took in ~ $13B in global ticket sales and < $2B of that went to non-US studios. (Also nuts is the percentages of 2019 global ticket sales attributable to the Avengers franchise and Disney.)
In 2017 US film industry revenues were ~$43B according to
https://deadline.com/2018/07/film-industry-revenue-2017-ibis...