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:
| Rnd | Date | Race Name | Length | Track | Location | Type | Pole Position | Winning Driver |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | March 18 | Jimmy Bryan 150 | mi (km) | Phoenix International Raceway | Avondale , Arizona | Oval | Danny Ongais | Gordon Johncock |
| 2.0 | March 26 | Datsun Twin 200 | mi (km) | Ontario Motor Speedway | Ontario , California | Oval | Tom Sneva | Danny Ongais |
| 3.0 | April 15 | Coors 200 | mi (km) | Texas World Speedway | College Station , Texas | Oval | Danny Ongais | Danny Ongais |
| 4.0 | April 23 | Gabriel 200 | mi (km) | Trenton International Speedway | Trenton , New Jersey | Oval | Tom Sneva | Gordon Johncock |
| 5.0 | May 28 | International 500 Mile Sweepstakes | mi (km) | Indianapolis Motor Speedway | Speedway , Indiana | Oval | Tom Sneva | Al Unser |
| 6.0 | June 11 | Molson Diamond Indy | mi (km) | Mosport Park | Bowmanville , Canada | Road course | Danny Ongais | Danny Ongais |
| 7.0 | June 18 | Rex Mays Classic | mi (km) | Wisconsin State Fair Park Speedway | West Allis , Wisconsin | Oval | Danny Ongais | Rick Mears |
| 8.0 | June 25 | Schaefer 500 | mi (km) | Pocono International Raceway | Long Pond , Pennsylvania | Oval | Danny Ongais | Al Unser |
| 9.0 | July 16 | Norton Twin 200 | mi (km) | Michigan International Speedway | Brooklyn , Michigan | Oval | Tom Sneva | Johnny Rutherford |
| 10.0 | July 23 | Gould Twin Dixie | mi (km) | Atlanta International Raceway | Hampton , Georgia | Oval | Tom Sneva | Rick Mears |
| 11.0 | August 6 | Texas Grand Prix | mi (km) | Texas World Speedway | College Station , Texas | Oval | Tom Sneva | A. J. Foyt |
| 12.0 | August 20 | Tony Bettenhausen 200 | mi (km) | Wisconsin State Fair Park Speedway | West Allis , Wisconsin | Oval | Danny Ongais | Danny Ongais |
| 13.0 | September 3 | California 500 | mi (km) | Ontario Motor Speedway | Ontario , California | Oval | Tom Sneva | Al Unser |
| 14.0 | September 16 | Gould Grand Prix | mi (km) | Michigan International Speedway | Brooklyn , Michigan | Oval | Johnny Rutherford | Danny Ongais |
| 15.0 | September 23 | Machinist Union 150 | mi (km) | Trenton International Speedway | Trenton , New Jersey | Oval | A. J. Foyt | Mario Andretti |
| 16.0 | October 1 | Daily Empress Indy Silverstone | mi (km) | Silverstone Circuit | Silverstone , United Kingdom | Road course | Danny Ongais | A. J. Foyt |
| 17.0 | October 7 | Daily Mail Indy Trophy | mi (km) | Brands Hatch (Indy Circuit) | Fawkham , United Kingdom | Road course | Al Unser | Rick Mears |
Question:
How many races took place on the Indianapolis Motor Speedway track?
Answer:
1.0