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]
(..) Before that,I spent four years working on my thesis. Before that,I was in college,and before that,I was in the fifth grade. This is my first d oayff in decades and I'm going to savor it. Okay. I'll let you get back to fixing your eggs. Not just fixing my eggs,I'm fixing everyone's eggs. (..)2007 TvShow: The Big Bang Theory Title: The Luminous Fish Effect Season: 1 Episode 4