The phrase "reduction rate" refers to the speed or amount at which something decreases or becomes smaller. It shows how fast or by what percentage something is reducing. Full definition
This translates into a more than 20 per cent cut in CO2 emissions from the road transport sector over the next six years, or an annual reduction rate of 3.5 per cent. (climateactionprogramme.org)
However, «This could be achieved only at substantially higher annual emission reduction rates and cost,» compared to taking action now. (france24.com)
This placed the average flu reduction rate for both groups of vaccinated mothers at 19 percent. (sciencedaily.com)