Covert a Z score to a quintile and return a number 1 thru 5 based on the quintile.

I have converted a raw score to a z score in one column
In the next column I want to find the quintile score and return a 1 for 0-20%, 2 for 21-40%, 3 for 41-60%, 4 for 61-80% and 5 for 81-100%

Thanks, Bob