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:
| Rd | Name | Pole Position | Fastest Lap | Winning driver | Winning team | Report |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Kraco Car Stereo 200 | Bobby Unser | Unknown | Johnny Rutherford | Chaparral | Report |
| 2.0 | Gould-Rex Mays 150 | Gordon Johncock | Unknown | Mike Mosley | All American Racers | Report |
| 3.0 | Kraco Twin 125 (R1) | Johnny Rutherford | Unknown | Rick Mears | Penske Racing | Report |
| 4.0 | Kraco Twin 125 (R2) | Rick Mears | Unknown | Rick Mears | Penske Racing | Report |
| 5.0 | Norton Michigan 500 | Tom Sneva | Unknown | Pancho Carter | Alex Foods | Report |
| 6.0 | Los Angeles Times 500 | Geoff Brabham | Unknown | Rick Mears | Penske Racing | Report |
| 7.0 | Tony Bettenhausen 200 | Johnny Rutherford | Unknown | Tom Sneva | Bignotti-Cotter | Report |
| 8.0 | Detroit News Grand Prix | Rick Mears | Unknown | Rick Mears | Penske Racing | Report |
| 9.0 | Watkins Glen 200 | Mario Andretti | Unknown | Rick Mears | Penske Racing | Report |
| 10.0 | II Copa Mexico 150 | Bobby Unser | Unknown | Rick Mears | Penske Racing | Report |
Question:
How many winning drivers in the kraco twin 125 (r2) race were there?
Answer:
1.0