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:
| City | Station | Year acquired | Primary programming source | Other programming sources | Current status |
| --- | --- | --- | --- | --- | --- |
| Edmonton | CITV | 1991.0 | Global | WIC | Global O&O |
| Hamilton | CHCH | 1990.0 | Independent (WIC programs only) | n/a | Independent station owned by Channel Zero |
| Lethbridge | CISA | 1989.0 | Global | WIC | Global O&O |
| Montreal | CFCF | 1997.0 | CTV | WIC | CTV O&O |
| Vancouver | CHAN | 1982.0 | CTV | WIC | Global O&O |
Question:
how many is the minimum for citv
Answer:
1991.0