user: ### NOW ANSWER:
Question: What is the latest available income inequality for the country with a population of 21,315,135?
Columns: ['Country', 'Area (km²) 2010', 'Population 2011', 'GDP (PPP) ( Intl. $ ) 2011', 'GDP (PPP) per capita ( Intl. $ ) 2011', 'Income inequality 1994–2011 (latest available)', 'HDI 2011', 'FSI 2012', 'CPI 2011', 'IEF 2011', 'GPI 2012', 'WPFI 2011/2012', 'DI 2011']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Algeria', '2,381,740', '35,980,193', '263,552,001,454', '8,715', '35.3', '0.698', '78.1', '2.9', '52.4', '2.255', '56.00', '3.44']
SQL:

assistant: SELECT "Income inequality 1994–2011 (latest available)" FROM "Table" WHERE "Population 2011" = '21,315,135';