user: Question: How many stations have Fox as the primary affiliation and have been owned since 1986?
Columns: ['City of license /Market', 'Station', 'Channel TV ( DT )', 'Owned since', 'Primary affiliation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Phoenix', 'KSAZ-TV ++', '10 (10)', '1997', 'Fox']
SQL:

assistant: SELECT COUNT("Station") FROM "Table" WHERE "Primary affiliation" = 'Fox' AND "Owned since" = '1986';