Historically what percentage of the Catholic Church's liturgical function was done in Latin?

I have been doing some research and reading about the history of what a church gathering looked like, prior to the Reformation. One thing I have not been able to find detailed information regarding which languages were employed in church services, for the majority of history up to the beginning of the Reformation. I understand that religious services were done in Latin, but it seems less clear whether the sermons (homilies), music, prayers and so on were also spoken in Latin or the vernacular instead. Specifically: - What percentage of a typical church service was performed in Latin prior to the Protestant Reformation? Note: I tagged this Catholicism because that was the primary denomination prior to the Reformation and the time period I am interested in