Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23619212_1 (_percentage_of_all_immigrants_2004 VARCHAR, _percentage_of_all_immigrants_2006 VARCHAR)

### Question ###
What's the percentage of immigrants in 2004 in the country with 2.1% of the immigrants in 2006?

### Accurate SQL ###

SELECT _percentage_of_all_immigrants_2004 FROM table_23619212_1 WHERE _percentage_of_all_immigrants_2006 = "2.1%"