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_name_88 (area__sq_mi_ INTEGER, administrative_division VARCHAR, national_share___percentage_ VARCHAR)

### Question ###
What is the average area in square miles for the hunan administrative division with a national share less than 2.19%?

### Accurate SQL ###

SELECT AVG(area__sq_mi_) FROM table_name_88 WHERE administrative_division = "hunan" AND national_share___percentage_ < 2.19