Table:
text: 1991 World Taekwondo Championships
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
1 South Korea 8 0 4 12
2 United States 2 2 1 5
3 Spain 2 1 4 7
4 Denmark 2 1 0 3
5 Turkey 1 3 2 6
6 Chinese Taipei 1 2 3 6
7 Netherlands 0 2 2 4
8 Canada 0 2 0 2
9 Egypt 0 1 3 4
10 Germany 0 1 1 2
11 Philippines 0 1 0 1
12 Mexico 0 0 3 3
13 Greece 0 0 2 2
14 Argentina 0 0 1 1
14 Australia 0 0 1 1
14 Brazil 0 0 1 1

Question: What is the silver for Mexico at the 1991 World Taekwondo Championships?