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]
(..) louder, more teeth. The good news? Our advances in gene splicing have opened up a whole new frontier. We've learned more from genetics in the past decade... than a century of digging up bones. So... when you say you want to sponsor an attraction... what do you have in mind? (..)2015 Jurassic World