Which Studio Ghibli film won the Academy Award for Best Animated Feature in 2003?

Who provided the voice of Darth Vader in the original 'Star Wars' trilogy? Which studio produced 'Toy Story', the first fully computer-animated feature film? Which studio produced 'Shrek' (2001)? Which film was the first to win the Academy Award for Best Animated Feature? Who directed 'Spirited Away'? Which Pixar film features a rat who wants to be a chef? Which Pixar film features a robot that cleans up an abandoned Earth? In which Pixar film does an old man tie balloons to his house?