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 county_public_safety (Crime_rate VARCHAR, Police_officers VARCHAR)

### Question ###
Show the crime rates of counties in ascending order of number of police officers.

### Accurate SQL ###

SELECT Crime_rate FROM county_public_safety ORDER BY Police_officers