Table:
text: Athletics at the 1963 Pan American Games
Medal table
Medal table
Rank_ Nation Gold Silver Bronze Total
1 United States 22 15 10 47
2 Canada 5 5 2 12
3 Argentina 2 2 1 5
4 Venezuela 1 3 3 7
5 Cuba 1 3 1 5
6 Mexico 1 1 1 3
7 Chile 1 0 0 1
8 Brazil 0 2 6 8
9 Jamaica 0 1 1 2
10 Guatemala 0 1 0 1
11 Trinidad and Tobago 0 0 2 2
11 Barbados 0 0 2 2
13 Panama 0 0 1 1
13 Puerto Rico 0 0 1 1
13 Uruguay 0 0 1 1
13 Netherlands Antilles 0 0 1 1

Question: What is the highest ranking nation with 15 silver medals and no more than 47 total in track and field at the 1963 Pan American Games?