The phrase "an increase of roughly" is correct and usable in written English.
It can be used when discussing approximate changes in quantity, size, or value.
Example: "The report indicated an increase of roughly 20% in sales over the last quarter."
Alternatives: "an approximate increase of" or "a rise of about".
A doubling of CO2 concentrations would represent an increase of roughly 4 watts per square metre of radiative forcing.
Revenue for the third quarter, which ended Sept. 25, rose to $1.46 billion from $1.13 billion last year, an increase of roughly 29percentt.
Boardwatch magazine, which tracks I.S.P.'s, recently reported more than 7,400 providers in North America, an increase of roughly 2,000 over last year.
In 2011, the average free-standing McDonald's restaurant in the United States generated nearly $2.6 million in sales, an increase of roughly 13 percent since 2008.
Compared with other days, there was an increase of roughly 6 percent in fatal crashes on tax day, equivalent to an additional 13 deaths.
From Jan . 1to June 15, 46 people were slain in Manhattan, up from 33 for the same period last year, an increase of roughly 40percentt, according to police statistics.
As Figure 7 reveals, higher levels of shadowing have a significant impact on location error, with an error increase of roughly 50% for every 2 dBm of additional signal shadowing standard deviation, for each node density.
With it, the PBS stations showed a combined increase of roughly 50percentt in their children's audience on Saturday mornings this season.
The premium is set each year to cover about 25percentt of projected spending under Part B. If Congress had eliminated the cut planned for doctors and simply frozen their Medicare fees in 2007, it would have required a further increase of roughly $1.50 in the monthly premium, Medicare officials said.
For instance, the European Patent Office granted 614,850 patents since 2006 [3]; the size of the United States Patent and Trademark Office corpus currently is 6,718,054 patents with a yearly increase of roughly 300,000 over the last 5 years [4].
Assuming that nothing's done to slow greenhouse emissions, the February report predicted a temperature increase of roughly 3°C toward the end of the century, drying at lower latitudes, more precipitation at higher latitudes, and rising sea levels.
