The phrase "a declining percentage of" is correct and usable in written English.
It can be used when discussing trends or changes in proportions or amounts over time.
Example: "A declining percentage of students are choosing to pursue degrees in the humanities."
Alternatives: "a decreasing proportion of" or "a diminishing share of".
What's worse, Social Security currently provides a declining percentage of the required retirement income.
They are attracting a declining percentage of medical students, and some states are facing a shortage of primary care doctors.
But much of this music passes largely unnoticed by African-Americans in New York, in part because since the 60's, the music's most likely consumers, the black middle class, represent a declining percentage of the city's African-American population.
Unemployment hasn't come down because a higher percentage of adults is employed; it's come down almost entirely because a declining percentage of adults is participating in the labor force, either by working or by actively seeking work.
The firms also are accounting for a declining percentage of a shrinking pool of stock trading, from 61 percent three years ago to 51 percent now, according to the Tabb Group, a data firm.
The numbers show that the latest iPhones have accounted for a declining percentage of sales each year.
Therefore, the use of a declining percentage, in applying the Sugarland factors in common fund cases, is a matter of discretion and is not required per se.
Hutton Group, Inc. supports the per se use of a declining percentage.
A significant, but declining, percentage of our 215,000 student enrollments are learners whose course of study is fully online, generally referred to as home schoolers.
It is the hard-pressed middle class that has been hit the hardest by skyrocketing tuition increases, a fact reflected in the declining percentage of UC and CSU students who come from middle-class families.
Based on 5 years of biannual prevalence studies a decreasing trend in the prevalence of HAI's and particularly urinary tract infections was observed as well as a decline in percentage of residents having antibiotics.
