The phrase "a shrinking proportion" is correct and usable in written English.
It can be used to describe a decreasing percentage or fraction of a whole in various contexts, such as demographics, economics, or statistics.
Example: "In recent years, a shrinking proportion of the population has been engaged in traditional farming practices."
Alternatives: "a declining share" or "a diminishing fraction."
Its productive capacity keeps soaring, but Chinese consumers are taking home a shrinking proportion of the total economy.
Population growth has provided a bit of a boost, but Americans have long spent a shrinking proportion of their income on food.
Republicans should broaden their base beyond a shrinking proportion of white voters not simply to win back Colorado, but because a more centrist outlook would be good for the country.
Though the cuts have been reversed, senior nutrition advocates have complained that even without sequestration, stagnant funding and an aging population have resulted in a shrinking proportion of needy seniors receiving help.
Today, unions still manage to bargain for the kind of wages and benefits that once characterized the American middle class, but the decades of anti-union policy by employers abetted by the NLRB mean they represent a shrinking proportion of the American workforce, now disproportionately in the public sector.
Although the construction sector employed less than one-tenth of the active workforce, its total exceeded that of agriculture and fishing, which constituted a shrinking proportion.
While the bulge in younger people, if they are educated, presents a potential "demographic dividend" for countries like Bangladesh and Brazil, the shrinking proportion of working-age people elsewhere may place a strain on governments and lead them to raise retirement ages and to encourage alternative job opportunities for older workers.
Nativists see the numbers, particularly the shrinking proportion of non-Hispanic whites, and fan the flames of racial hatred.
Even if young researchers are not thrilled with the shrinking proportion of tenure-track positions, she says, the changing tenure picture provides opportunities for them to take advantage of their unique strengths and form new, unconventional collaborations.
And the shrinking proportion of vets within the population means that, while they're still a key voting block that's constantly praised by politicians, if history is any guide they'll have less and less political power in coming years.
It's a shrinking proposition.
