The phrase "immense increase in" is grammatically correct and can be used in written English.
It is often used to describe a significant growth or rise in something. Example: There has been an immense increase in the number of tourists visiting this city in the last year.
A program designed by the country's military dictatorship in the 1970's to drive development was responsible for an immense increase in sugar output.
Perhaps the most significant factor, however, was the rise of the dealer to whom, according to The Art Journal (1871), "have been owing the immense increase in the prices of modern pictures".
Today's depression presumably won't be that bad, but it may cause a huge loss of output, an immense increase in the national debt, a swing to excessive regulation, a nasty bout of inflation, a decline in America's economic and geopolitical power, and increased political instability abroad.
Recently, immense increase in the number of automobiles on the road made driving difficult and unsafe.
The major concern in fully three-dimensional computations is the immense increase in the number of unknown variables.
In the early post-war period a number of newly developed innovations in the life sciences were made widely available, contributing to the eradication of some dreadful diseases and making an immense increase in harvest yields possible.
They lent to banks, purchased securities, financed securities, intervened in currency markets, tolerated immense increases in float (i.e., in the volume of checks written but uncleared).
Tuition at Rensselaer, like that of other private colleges, has seen immense increases in recent years.
The last decade has witnessed an immense increase of wireless communications services in order to keep pace with the ever increasing demand for higher data rates combined with higher mobility.
A CANCER is overtaking our space agency: the routine acquiescence to immense cost increases in projects.
This could be an immense contribution to the increase in fatigue life of the joint, but other hot spot sites are introduced into the joint.
