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]
(..) to want to get caught. What good are all those brilliant crimes if no one takes the credit? So she leaves crumbs. Now, the hard part, why you spend a decade in school, is seeing the crumbs for the clues they are. Sometimes the thing you thought was the most brutal aspect of the virus, (..)2013 World War Z