'rising percentage' is correct and usable in written English.
You can use it to describe a number or quantity that is increasing. For example, "The rising percentage of people living in poverty is alarming."
Yet most of the increase was caused by population growth, not by a rising percentage of people attending.
Firms with a structure that increases compensation by a rising percentage are associated with lower ROA one and two years out and on a three-year average.
Institutions charging more than £6,000 will have to pay a rising percentage of each additional £1,000 as a levy to government.
Sheffield Homes raised concerns that an average annual tenancy turnover was masking an abnormally high and rising percentage turnover in the first two years of tenancy.
This was not a huge surprise — any report can tell you the rising percentage of technology ownership among families in emerging markets.
For Mathewson, the rising percentage of college-educated players entering the big leagues was irreversible, and dimwitted free swingers and fireballers would shortly go the way of the gloveless catcher.
The unemployment rate rose 0.1 percentage point to 7.9 percent in January.
Perhaps the card company told you that the interest rate was rising 4 percentage points.
But Google continued to gain ground rising 6.5 percentage points to capture 21.4percentt of smartphone subscribers.
While receivables have been rising, the percentage of underperforming loans remains only marginally above average.
(Windows Phone made only marginal gains in the U.S., rising 2.1 percentage points to take a 4.7% marketshare).
