DS在美国的头14个月销量是多少？

The Nintendo 3DS has outsold the Nintendo DS by about 1 million units in their respective first 14 months in the market "and the DS went on to become the best-selling gaming hardware system ever."

Nintendo has said that it sold 4.5 million 3DS systems in the U.S. in its first year of availability.

http://content.usatoday.com/comm ... lide/1#.T6xNL-trOa9

3DS在美国前十四个月销量超过了DS同期一百万台，谁知道DS在美国的头14个月销量是多少？