Let's go back what happened when the last pageant became the ultimate decider on which country will win "Performer of the Year".
2014 (prior to last pageant): Thailand
2014 (winner after last pageant): USA (Thailand ended up as clapper at 63rd Miss Universe)
2015 (prior to last pageant): Philippines
2015 (winner after last pageant): Philippines
2016 (prior to last pageant): Indonesia
2016 (winner after last pageant): Philippines (Philippines only needed to score better than Indonesia in order to get the "Performer of the Year" and it did Philippines finished in the Top 6 while Indonesia finished in the Top 13 at 65th Miss Universe)
2017 (prior to last pageant): Venezuela
2017 (winner after last pageant): Colombia (Venezuela clapped at Miss Supranational 2017)
2018 (prior to last pageant): Mexico
2018 (winner after last pageant): Venezuela (Mexico clapped at Miss Universe 2018, later finished 1st Runner Up at Miss International 2019)
After Miss Earth and Miss International 2019, The current top performing countries are: Puerto Rico, Thailand, Belarus, Colombia and Philippines. With 3 pageants remaining, it is still anyone's ballgame at this point.