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_27750 ( "Year" real, "Division" real, "League" text, "Regular Season" text, "Playoffs" text, "Open Cup" text )

### Question ###
Name the year for open cup did not qualify and national final

### Accurate SQL ###

SELECT COUNT("Year") FROM table_27750 WHERE "Open Cup" = 'Did not qualify' AND "Playoffs" = 'National Final'