user: Question: How many intro dates have the price of 686€?
Columns: ['Manufacturer', 'Model', 'Intro Date', 'Interface', 'OS', 'Price (USD)', 'Price', 'Throughput']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Simtec Electronics', 'Entropy Key', '2009', 'USB', 'Windows/Linux/BSD', 60.0, '£36', '32 kbit/s']
SQL:

assistant: SELECT COUNT("Intro Date") FROM "Table" WHERE "Price" = '686€';