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]
(..) Aram, the plane Tom was on. Who owns it? Reddington! Hey! What the hell?! What's going on, Omar? I've known you for over two decades. I was there when you renewed your vows with Eileen. And suddenly, you're the person who takes Tom Keen and his child out of the country? (..)2016 TvShow: The Blacklist Title: Alexander Kirk (No. 14): Conclusion Season: 3 Episode 23