Considering that there were hardly any increments in salary last year, I think that any increment below 26% is not justifiable.
The inflation since April 2008 till Nov 2009 was 26.31% (based on Consumer Price Index - Urban - Industrial Worker). So, if you received a 0% increment last year, you should get at least a 26.31% increment this year to maintain your 2008 income levels in 'real' terms. However, do not expect this level of increments this year as the recession has just ended, and companies still need to build up their cash flows to that extent.
I believe that a 10% to 15% increment should be ideal in most recession-affected industries, while increments may go up to 20% in the financial and banking sectors. This is just an estimate, and increments would depend on the industry and may also vary among companies within the same industry.