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 | Entrant | Chassis | Engine | Points |
| --- | --- | --- | --- | --- |
| 1997.0 | Mild Seven Benetton Renault | Benetton B197 | Renault RS9 3.0 V10 | 4 |
| 1998.0 | Mild Seven Benetton Playlife | Benetton B198 | Playlife GC37-01 3.0 V10 | 17 |
| 1999.0 | Mild Seven Benetton Playlife | Benetton B199 | Playlife FB01 3.0 V10 | 3 |
| 2000.0 | Mild Seven Benetton Playlife | Benetton B200 | Playlife FB02 3.0 V10 | 2 |
| 2005.0 | Team McLaren Mercedes | McLaren MP4-20 | Mercedes FO 110R 3.0 V10 | 6 |
| 2006.0 | WilliamsF1 Team | Williams FW28 | Cosworth CA2006 2.4 V8 4 Series | – |
| 2007.0 | AT&T Williams | Williams FW29 | Toyota RVX-07 2.4 V8 | 13 |
Question:
What year was the cosworth ca2006 2.4 v8 4 series used?
Answer:
2006.0