CREATE TABLE table_31331 ("Manufacturer" CLOB, "Model" CLOB, "Intro Date" CLOB, "Interface" CLOB, "OS" CLOB, "Price  ( USD ) " FLOAT, "Price" CLOB, "Throughput" CLOB)

What is the intro date for the throughput of 16 mbit/s?
SELECT "Intro Date" FROM table_31331 WHERE "Throughput" = '16 Mbit/s'
SELECT "Intro Date" FROM "table_31331" WHERE "Throughput" = '16 Mbit/s'