Plate Weight

Cxompetitive weightlifters out there: What weights are each individual colour weight plate?

Here is a picture of a weightlifting bar:
http://www.sunzeri.com/AthletesCongress/AC_files/York-bar.jpg
Can anyone tell me what weights each colour weight is please?
also, are these colours and the weights they represent the same globally or in such and such a country the red plate is 20kg and in another [...]