"the 10-years evolution show..." or "the 10-year evolution shows..."

Question

What is the correct sentence between these two forms:

"the 10-years evolution show..."

or

"the 10-year evolution shows...".

?

Both answers seem okay to me. Also, what about the dash between 10 and year?

Answer 1

The correct is "the 10-year evolution shows". The 10-year is adjective for evolution, it clarifies the period of evolution.