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:
| Year | Competition | Venue | Position | Notes |
| --- | --- | --- | --- | --- |
| 1985.0 | World Cross Country Championships | Lisbon , Portugal | 2nd | Junior race |
| 1985.0 | World Cross Country Championships | Lisbon , Portugal | 1st | Team competition |
| 1986.0 | World Cross Country Championships | Neuchâtel , Switzerland | 6th | Junior race |
| 1988.0 | World Cross Country Championships | Auckland , New Zealand | 12th | Long race |
| 1988.0 | World Cross Country Championships | Auckland , New Zealand | 2nd | Team competition |
| 1991.0 | World Cross Country Championships | Antwerp , Belgium | 2nd | Team competition |
Question:
What is the average year of events that took place in Antwerp, Belgium?
Answer:
1991.0