depends what for!
Every ten years=once a decade
Liverpool and Berlin hosts a passion play every ten years.
a census is every 10 years
decennial Occurring every ten (10) years. Also tenth anniversary
They are cut down every ten years to rejuvenate the forest.
It is a decennial.
A decade.
Every ten years, the Jesse and Miles go to the spring and see their parents.
Every ten years
Every ten years in the Census.
each census is taken every 10 years