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_27434_2 ( period VARCHAR, life_expectancy_total VARCHAR )

### Question ###
What period was the life expectancy at 62.4?

### Accurate SQL ###

SELECT period FROM table_27434_2 WHERE life_expectancy_total = "62.4"