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:
| Venue | Location | Environment | Closed | Reason |
| --- | --- | --- | --- | --- |
| Charlotte Coliseum | Eagle Lake, Charlotte | Indoor arena | 2005 | Replaced |
| Jim Crockett Park | Dilworth, Charlotte | Open air, natural grass | 1985 | Arson |
| Metrolina Speedway | Metrolina Fairgrounds, Charlotte | Open air, dirt | 1990s | Abandoned |
| Belk Gymnasium | University City, Charlotte | Indoor arena | 1996 | Converted |
| Charlotte Speedway | Charlotte | Open air, dirt | 1957 | Closed |
Question:
What were the reasons that venues closed in the 1990s?
Answer:
Abandoned