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 architect ( id text, name text, nationality text, gender text )
TABLE: CREATE TABLE bridge ( architect_id int, id int, name text, location text, length_meters real, length_feet real )
TABLE: CREATE TABLE mill ( architect_id int, id int, location text, name text, type text, built_year int, notes text )

### Question ###
How many mills of 'Grondzeiler' type are built in each year? Give me the trend, rank from low to high by the x-axis.

### Accurate SQL ###

SELECT built_year, COUNT(built_year) FROM mill WHERE type = 'Grondzeiler' ORDER BY built_year