user: Question: In the Central region, what was the infiltration (km 3 /year)?
Columns: ['Region', 'Land area (km 2 )', 'Rainfall by depth (mm/year)', 'Rainfall by volume (km 3 /year)', 'Surface run off (km 3 /year)', 'Infiltration (km 3 /year)', 'Evapotranspiration (km 3 /year)']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Chorotega', '9,552.4', 2006.0, '19.2', '5.7', '3.5', '10.3']
SQL:

assistant: SELECT "Infiltration (km 3 /year)" FROM "Table" WHERE "Region" = 'Central';