The phrase "an increase since" is correct and usable in written English.
It can be used to indicate a rise or growth in a particular metric or value from a specific point in time up to the present.
Example: "There has been an increase since last year in the number of participants in the program."
Alternatives: "a rise since" or "an uptick since".
Staff have not had an increase since 2008.
It ends the longest period without an increase since the federal minimum wage was enacted in 1938.
It will be only the second year without an increase since automatic adjustments for inflation were adopted in 1975.
Lammy also said he believed that there had been an increase since the riots in the police's use of the Section 60 power to stop and search.
If the government gets its way, by the next election it will be 105,000 – an increase since the war of roughly 60%.
The gain is small potatoes compared with the last high point, $44,974 in 1989, an increase since that year of about $2,000 or 4.5percentt.
New Jersey Transit officials promised there would be no fare increase this fiscal year or the next for its 360,000 daily rail and bus riders, who have not seen an increase since 1990.
For the first category, which includes the Metropolitan Museum of Art and the Bronx Historical Society, Mr. Giuliani has recommended $88.5 million, an increase since 1990 of more than $14 million.
However, the wealth share of the top 10% has still increased substantially since 1980 using the raw data; there has also been an increase since 1980 for the top 1% but this pattern is less marked.
In 2009, acute femoral neck fractures accounted for 94% of the recordings, which was an increase since 2005 911%).
The age-standardized prevalence of diabetes in 2009 was 22.3% (95% CI 20.0 24.6) among men and 20.2% (18.3 22.3) among women, representing an increase since 1987 of 64 and 62% among men and women, respectively.
