Passage: Since 1981, new prizes have been presented: the Prix Orange (for the player demonstrating the best sportsmanship and cooperative attitude with the press), the Prix Citron (for the player with the strongest character and personality) and the Prix Bourgeon (for the tennis player revelation of the year). In another novelty, since 2006 the tournament has begun on a Sunday, featuring 12 singles matches played on the three main courts. Additionally, on the eve of the tournament's opening, the traditional Benny Berthet exhibition day takes place, where the profits go to different charity associations. In March 2007, it was announced that the event would provide equal prize money for both men and women in all rounds for the first time.

Question: when did the tournament begin
2006