user: Question: How many KEI catagories are listed when the economic incentive regime is 2.56? 
Columns: ['Country', 'KEI', 'KI', 'Economic Incentive Regime', 'Innovation', 'Education', 'ICT', '2008 Rank']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Denmark', '9.58', '9.55', '9.66', '9.57', '9.80', '9.28', 1.0]
SQL:

assistant: SELECT COUNT("KEI") FROM "Table" WHERE "Economic Incentive Regime" = '2.56';