Table:
text: 2006 UCI Cyclo-cross World Championships
Medal table
Medal table
Nation Gold Silver Bronze Total
Netherlands (NED) 2 1 1 4
Belgium (BEL) 1 1 2 4
Czech Republic (CZE) 1 0 0 1
Germany (GER) 0 1 0 1
Slovakia (SVK) 0 1 0 1
France (FRA) 0 0 1 1

Question: What is the average number of silver medals for nations with more than one bronze medal at the 2006 UCI Cyclocross World Championships?