Table:
text: Double trap
World Championships, total medals
World Championships, total medals
Rank_ Nation Gold Silver Bronze Total
1 Italy 18 5 12 35
2 United States 10 10 9 29
3 China 7 15 9 31
4 Australia 5 8 0 13
5 Finland 4 1 3 8
6 Great Britain 3 2 4 9
7 USSR 2 2 0 4
8 Russia 2 1 4 7
9 Kuwait 1 1 3 5
10 Chinese Taipei 1 1 2 4
11 Spain 1 1 0 2
11 United Arab Emirates 1 1 0 2
13 South Korea 1 0 4 5
14 France 1 0 2 3
15 Sweden 0 3 0 3

Question: How many total gold medals has Australia won in double trap at world championships, total medals?