Table:
text: List of tennis stadiums by capacity
WTA tour venues
WTA tour venues
Rank_ Stadium Capacity City Country Tournament_hosted
1 Arthur Ashe Stadium 23200 New York City United States US Open
2 Sinan Erdem Dome 16410 Istanbul Turkey WTA Championships
3 Indian Wells Tennis Garden 16100 Indian Wells, California United States BNP Paribas Open
4= Cullman-Heyman Tennis Center 15000 New Haven, Connecticut United States New Haven Open at Yale
4= National Tennis Stadium 15000 Beijing China China Open ; 2008 Olympics
4= Wimbledon Centre Court [a ] 15000 London United Kingdom The Championships, Wimbledon
7 Stade Roland Garros - Court Philippe Chatrier 14911 Paris France French Open
8 Rod Laver Arena 14820 Melbourne Australia Australian Open

Question: What is the average capacity of Rod Laver Arena among the list of tennis stadiums by capacity among WTA Tour venues?