Write SQL query to solve given problem: What is the percentage of offense rebounds from the total rebounds of the players in year 2000.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(T2.o_rebounds) AS REAL) * 100 / SUM(T2.rebounds) FROM players_teams AS T1 INNER JOIN player_allstar AS T2 ON T1.playerID = T2.playerID WHERE T1.year = 2000