Table:
text: 1977 World Wrestling Championships
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
1 Soviet Union 9 5 0 14
2 Japan 2 1 0 3
3 Bulgaria 1 2 7 10
4 Romania 1 2 2 5
5 East Germany 1 2 1 4
6 Sweden 1 1 1 3
6 United States 1 1 1 3
8 Hungary 1 0 3 4
9 Czechoslovakia 1 0 0 1
9 Finland 1 0 0 1
9 West Germany 1 0 0 1
12 Yugoslavia 0 2 2 4
13 Poland 0 2 0 2
14 Iran 0 1 1 2
15 Turkey 0 1 0 1
16 Mongolia 0 0 1 1

text: 1977 World Wrestling Championships
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
16 South Korea 0 0 1 1
Total Total 20 20 20 60

Question: What is the average silver for gold over 2, ranks over 1 and bronze over 0 at the 1977 World Wrestling Championships?