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 | National Wins | Drivers | Driver Wins |
| --- | --- | --- | --- | --- |
| 1.0 | United Kingdom | 8.0 | Dario Franchitti | 2007.0 |
| 1.0 | United Kingdom | 8.0 | Dan Wheldon | 2005.0 |
| 1.0 | United Kingdom | 8.0 | George Robson [b] | 1946.0 |
| 1.0 | United Kingdom | 8.0 | Jim Clark | 1965.0 |
| 1.0 | United Kingdom | 8.0 | Graham Hill | 1966.0 |
| 2.0 | Brazil | 7.0 | Hélio Castroneves | 2001.0 |
| 2.0 | Brazil | 7.0 | Emerson Fittipaldi | 1989.0 |
| 2.0 | Brazil | 7.0 | Gil de Ferran [a] | 2003.0 |
| 2.0 | Brazil | 7.0 | Tony Kanaan | 2013.0 |
| 3.0 | France | 3.0 | Jules Goux | 1913.0 |
| 3.0 | France | 3.0 | René Thomas | 1914.0 |
| 3.0 | France | 3.0 | Gaston Chevrolet [b] | 1920.0 |
| 3.0 | Italy | 3.0 | Ralph DePalma | 1915.0 |
| 3.0 | Italy | 3.0 | Dario Resta [c] | 1916.0 |
| 3.0 | Italy | 3.0 | Mario Andretti [b] | 1969.0 |
| 5.0 | Netherlands | 2.0 | Arie Luyendyk | 1990.0 |
| 6.0 | Canada | 1.0 | Jacques Villeneuve | 1995.0 |
| 6.0 | Sweden | 1.0 | Kenny Bräck | 1999.0 |
| 6.0 | Colombia | 1.0 | Juan Pablo Montoya | 2000.0 |
| 6.0 | New Zealand | 1.0 | Scott Dixon | 2008.0 |
Question:
What is the average number of wins of drivers from Sweden?
Answer:
1999.0