this grid applied a 2 per cent increase a year.. but this is speculation , since the salary increase is based on oecd inflation rate, if the rate is 4 per cent then salaries would (should) increase by 4 percent if let say 1.3 ..well.
Salary should not be reduced in case of deflation though.
Tips : we are not supposed to accept tips, if accepted should be send to the office, the same if a manufacturer is offering a airplane model for example.