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_94 (introduced INTEGER, retired VARCHAR, manufacturer VARCHAR, quantity VARCHAR)

### Question ###
How many in the introduced section had Fokker as a manufacturer, a quantity of 5, and retired later than 1999?

### Accurate SQL ###

SELECT SUM(introduced) FROM table_name_94 WHERE manufacturer = "fokker" AND quantity = 5 AND retired > 1999