The phrase "a substantial increase over" is correct and usable in written English.
It can be used when discussing a significant rise or growth in a particular metric or value compared to a previous point of reference.
Example: "The company reported a substantial increase over last year's sales figures, indicating strong market demand."
Alternatives: "a significant rise compared to" or "a considerable growth from".
The United Nations Humanitarian Action Plann has a proposed budget of $870.5 million, a substantial increase over previous years, because the increased level of NATO military activity has led to increased needs for services in many parts of the country, according the United Nations.
That number was a substantial increase over prior years, tripling the year-end total of 21 in 2002.
There are about 17,000 personel at the site, according to Deputy Garrison Commander John Terence Smith, a substantial increase over last year.
If that trend continued, it would represent a substantial increase over last year's reported 2,970 deaths for Afghan security forces, including both police officers and soldiers.
Mr. Swigart would not disclose the cost of the campaign, other than to say the company would spend a "substantial increase" over 2011.
The E.E.O.C. has also observed a substantial increase over the last 15 years in discrimination charge filings based on color, which have risen to 1,241 in 2006 from 374 in 1992.
Because, says Mark Brown, a Ph.D. pharmacologist who took that unconventional step, the additional year of study provides "tools to move into industry and make an immediate contribution" to a company, and to do so at "a substantial increase in income" over what he might otherwise have earned.
Table 3 records a substantial increase in TLE over the decades in Kerala.
Simulation studies demonstrate advantages of the approach, including a substantial increase in power over competing methods.
Thus, PopMod, with four disease states, respresents a substantial increase in complexity over population models modelling only two disease states (e.g. diseased and healthy).
Comparison between the high and low populations leads to a substantial increase in power over the comparison between the high and neutral populations.
