The 'decade' of the 1920s runs from January 1, 1920 to December 31, 1929.
There have been a lot of changes during/in/over the past two 'decades'.
a 'decade' of drought [=a drought that lasted 10 years]
(..) Sweets! Hey, Romanov, good to see you. You have been conspicuously absent for the past decade. Whoa, Sweets! Hi, Lance! Hey, guys. These-these guys know you? Ten years ago, Sweets was one of the youngest chess masters (..)2014 TvShow: Bones Title: The Master in the Slop Season: 9 Episode 14