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 | Team | Co-Drivers | Class | Laps | Pos. | Class Pos. |
| --- | --- | --- | --- | --- | --- | --- |
| 1997.0 | BMS Scuderia Italia | Pierluigi Martini Antônio Hermann de Azevedo | GT1 | 317.0 | 8th | 4th |
| 1999.0 | JB Racing | Jérôme Policand Mauro Baldi | LMP | 71.0 | DNF | DNF |
| 2001.0 | Audi Sport North America | Laurent Aïello Rinaldo Capello | LMP900 | 320.0 | 2nd | 2nd |
| 2002.0 | Audi Sport North America | Johnny Herbert Rinaldo Capello | LMP900 | 374.0 | 2nd | 2nd |
| 2005.0 | BMS Scuderia Italia | Fabrizio Gollin Miguel Ramos | GT1 | 67.0 | DNF | DNF |
| 2006.0 | BMS Scuderia Italia | Fabrizio Gollin Fabio Babini | GT1 | 3.0 | DNF | DNF |
Question:
How many years was the number of laps 71?
Answer:
1.0