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:
| Margin | Score | Opponent | Venue | Year |
| --- | --- | --- | --- | --- |
| 66.0 | 66–0 | South Sydney Rabbitohs | Sydney Football Stadium | 2006.0 |
| 58.0 | 68–10 | Northern Eagles | Mt Smart Stadium | 2002.0 |
| 46.0 | 52–6 | North Queensland Cowboys | Mt Smart Stadium | 1996.0 |
| 44.0 | 60–16 | Western Suburbs | Campbelltown | 1999.0 |
| 44.0 | 52-8 | Penrith Panthers | Mt Smart Stadium | 2001.0 |
Question:
Name the sum of year for penrith panthers opponent
Answer:
2001.0