Table:
text: Powerlifting at the 2008 Summer Paralympics
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
12 United Arab Emirates (UAE) 0 1 0 1
15 Thailand (THA) 0 0 2 2
16 France (FRA) 0 0 1 1
16 Laos (LAO) 0 0 1 1
16 Malaysia (MAS) 0 0 1 1
16 South Korea (KOR) 0 0 1 1
16 Syria (SYR) 0 0 1 1
Total Total 20 20 20 60

Question: What is the average gold value if rank is overall and silver is 20+ for powerlifting at the 2008 Summer Paralympics?