Appropriate rate for settlement

From 31 October 2011 the Immigration Rules
have been amended: Tier 2 (General), Tier 2 (Intra
Company Transfer) and Work Permit holders applying
for settlement must provide specified documentary
evidence in order to demonstrate that they are being
paid at or above the appropriate rate for settlement
applications. The documents you must provide with
your application are either: a payslip and a personal
bank or building society statement, or a payslip and a
building society pass book.

I'm a work permit holder from 2009.
I tried to look for the appropriate rate but struggle to find it. Can anyone tell me?

You should be able to find it in the Codes of practice.