Graphs with a ring shape ?

Hey every one,

I've got a problem to create a ring shape graphic (like excel one) in keynote and number. I tried to reproduce it with advanced gradient colour option but it didn't work at all.

In order to be clear, here is what i'm trying to reproduce :

Do you have any idea to resolve this problem please ?

Thank you in advance.

ps: sorry if i made some mistakes, english isn't my native language.