How many adventure movies are there that were released in 2000?
adventure movies refers to genre_name = 'Adventure'; released in 2000 refers to release_date LIKE '2000%'
SELECT COUNT(T1.movie_id) FROM movie AS T1 INNER JOIN movie_genres AS T2 ON T1.movie_id = T2.movie_id INNER JOIN genre AS T3 ON T2.genre_id = T3.genre_id WHERE T3.genre_name = 'Adventure' AND CAST(STRFTIME('%Y', T1.release_date) AS INT) = 2000