Given this paragraph about video game consoles, when was the Nintendo DS released?

Context: In 2004, Nintendo released the Nintendo DS, which featured such innovations as dual screens – one of which being a touchscreen – and wireless connectivity for multiplayer play. Throughout its lifetime, more than 154 million units were sold, making it the most successful handheld console and the second best-selling console in history. In 2005, Nintendo released the Game Boy Micro, the last system in the Game Boy line. Sales did not meet Nintendo's expectations, with 2.5 million units being sold by 2007. In mid-2005, the Nintendo World Store was inaugurated in New York City.

Answer: 2004