What's the percentage of immigrants in 2004 in the country with 2.1% of the immigrants in 2006?
CREATE TABLE table_23619212_1 (
    _percentage_of_all_immigrants_2004 VARCHAR,
    _percentage_of_all_immigrants_2006 VARCHAR
)
SELECT _percentage_of_all_immigrants_2004 FROM table_23619212_1 WHERE _percentage_of_all_immigrants_2006 = "2.1%"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What's the percentage of immigrants in 2004 in the country with 2.1% of the immigrants in 2006? ### Input: CREATE TABLE table_23619212_1 (
    _percentage_of_all_immigrants_2004 VARCHAR,
    _percentage_of_all_immigrants_2006 VARCHAR
) ### Response: SELECT _percentage_of_all_immigrants_2004 FROM table_23619212_1 WHERE _percentage_of_all_immigrants_2006 = "2.1%"