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]
(..) Yeah, we picked the wrong year, though. You... bypassing the Sierra? Sure. I'll bypass anything. Should I? Oh, it's completely socked in. Biggest snowfall in a decade or so. Yeah, nobody's getting through that. Say... how 'bout we make a plan up in Kennedy Meadows? I'm... I'm staying there (..)2014 Wild