The phrase "the proportion increases" is grammatically correct and can be used in written English.
Example: As the number of years spent in education increases, so does the proportion of people with advanced degrees in the workforce.
The proportion increases as they age with considerably higher rates for women; almost 1.5 times those of men.
When renewables supply only a small proportion of the power on a grid this effect is negligible but as the proportion increases the costs can become more significant.
But the proportion increases to one in seven in falling markets, even though there are more changes during market routs.
In unselected civilian groups, about 20% of those with mTBI have photalgia of some kind10 and in those who already have a range of visual problems, the proportion increases to about 50%11.
After hearing the descriptions, the proportion increases to 54%.
In POWER, the proportion increases more steeply than in other networks as more nodes are observed.
The proportion increased when a related article appeared in the Daily Mail after the study was concluded.
Today, slightly more people take a pragmatic view, the proportion increasing slightly, from 53% to 54% of the total.
Relative to GDP, this amounts to 121.5%, and the proportion increased by 150 basis points every quarter over the past year.
"That's why I'm pleased to see more people from more disadvantaged backgrounds going into higher education, with the proportion increasing by three percentage points since 2002.
In the United States, for example, the number of people engaged in service occupations in the 1950s already exceeded the number of those employed in industry, and the proportion increased thereafter.
