user: Question: What is the intro date for the throughput of 16 Mbit/s?
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 "Intro Date" FROM "Table" WHERE "Throughput" = '16 Mbit/s';