Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Nation | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- |
| 1 | Soviet Union | 9.0 | 5.0 | 2.0 | 16.0 |
| 2 | Hungary | 4.0 | 1.0 | 0.0 | 5.0 |
| 3 | Bulgaria | 2.0 | 2.0 | 3.0 | 7.0 |
| 4 | Japan | 2.0 | 2.0 | 1.0 | 5.0 |
| 5 | United States | 1.0 | 5.0 | 4.0 | 10.0 |
| 6 | Romania | 1.0 | 0.0 | 2.0 | 3.0 |
| 7 | Poland | 1.0 | 0.0 | 1.0 | 2.0 |
| 7 | Sweden | 1.0 | 0.0 | 1.0 | 2.0 |
| 9 | East Germany | 0.0 | 2.0 | 2.0 | 4.0 |
| 10 | West Germany | 0.0 | 1.0 | 3.0 | 4.0 |
| 11 | Yugoslavia | 0.0 | 1.0 | 0.0 | 1.0 |
| 12 | Italy | 0.0 | 0.0 | 1.0 | 1.0 |
| Total | Total | 21.0 | 19.0 | 20.0 | 60.0 |
Question:
What is the average number of silver medals of the nation with 3 bronzes and more than 4 total medals?
Answer:
2.0