user: Question: What's the percentage of immigrants in 2004 in the country with 2.1% of the immigrants in 2006?
Columns: ['Country', '% of all immigrants 2008', '% of all immigrants 2007', '% of all immigrants 2006', '% of all immigrants 2005', '% of all immigrants 2004']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Algeria', '11.2%', '12.0%', '14.1%', '14.0%', '15.2%']
SQL:

assistant: SELECT "% of all immigrants 2004" FROM "Table" WHERE "% of all immigrants 2006" = '2.1%';