'a decline in usage' is correct and usable in written English.
You can use it to describe a decrease in the frequency or amount of something that is being used. For example: "We have seen a decline in usage of the library since the outbreak of the pandemic."
In contrast, does a decline in usage mean that teachers found that it wasn't right for their students, who are disproportionately from large, poor, and urban schools?
Full screen interstitial, as well as 300 x 250 and 728 x 90 ads are all showing positive growth, while 320 x 50 ads on the iPhone specifically have seen a decline in usage.
But just as a meatpacking company that sold tainted beef, over and over again, that made people ill, would eventually see a decline in sales, so too a social web which is infected with the abuse will inevitably see a decline in usage.
A decline in Nokia usage from January 2012 to January 2013 means the Finnish company ceded the top spot to Apple," said Aodhan Cullen, CEO, StatCounter, in a statement.
A decline in Facebook usage could translate into a rise in traffic for a host of niche content and discussion platforms focused on sports, celebrities, social issues and other subjects.
Richard Dieter, executive director of the Death Penalty Information Center, said the numbers reflect a decline in the usage of the death penalty in recent years.
In addition, the steadily increased use of solar, wind, and other alternative energy sources, has meant a decline in coal usage.
Despite a recent decline in usage for some of Zynga's biggest hits, the company says that 100 million people every month play one or more of its games.
For example, the personalization category lost the most traction, with a 46percentt decline in usage.
Amazon says that the decision to close the service was based on "a significant decline" in usage, and cited the popularity of "free to play" business models as a factor.
Younger Users – When asked if there was a possible decline in usage by younger users, Zuckerberg said there's been "steady growth and engagement in all the cohorts including younger cohorts".
