The phrase "percentage jump" refers to the increase or rise in a certain value or quantity, expressed as a percentage. It indicates how much something has increased compared to its original amount. Full definition
If it's a close game, late that percentage jumps into the high 90's. (sbnation.com)
Not since 1940 has the nation seen a larger annual percentage jump in U.S. oil production. (exxonmobilperspectives.com)
By tacking on a contrarian filter and examining unders that receive less than 30 % of public support, our winning percentage jumps from 53.4 % to 55.5 %. (sportsinsights.com)