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 | Race Name | Circuit | City/Location | Date | Pole position | Fastest lap | Winning driver | Winning team | Report |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | Dailkyo IndyCar Grand Prix | Surfers Paradise Street Circuit | Surfers Paradise , Australia | March 22 | Al Unser, Jr. | Emerson Fittipaldi | Emerson Fittipaldi | Marlboro Team Penske | Report |
| 2 | Valvoline 200 | Phoenix International Raceway | Phoenix, Arizona | April 5 | Michael Andretti | Rick Mears | Bobby Rahal | Rahal-Hogan Racing | Report |
| 3 | Toyota Grand Prix of Long Beach | Streets of Long Beach | Long Beach, California | April 12 | Michael Andretti | Unknown | Danny Sullivan | Galles-Kraco Racing | Report |
| 4 | 76th Indianapolis 500 | Indianapolis Motor Speedway | Speedway, Indiana | May 24 | Roberto Guerrero | Michael Andretti | Al Unser, Jr. | Galles-Kraco Racing | Report |
| 5 | ITT Automotive Grand Prix of Detroit | The Raceway on Belle Isle Park | Detroit, Michigan | June 7 | Michael Andretti | Unknown | Bobby Rahal | Rahal-Hogan Racing | Report |
| 6 | Budweiser/G.I.Joe´s 200 | Portland International Raceway | Portland, Oregon | June 21 | Emerson Fittipaldi | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| 7 | Miller Genuine Draft 200 | Milwaukee Mile | West Allis, Wisconsin | June 28 | Bobby Rahal | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| 8 | New England 200 | New Hampshire International Speedway | Loudon, New Hampshire | July 5 | Bobby Rahal | Michael Andretti | Bobby Rahal | Rahal-Hogan Racing | Report |
| 9 | Molson Indy Toronto | Exhibition Place | Toronto, Ontario | July 19 | Bobby Rahal | Unknown | Michael Andretti | Newman/Haas Racing | Report |
| 10 | Marlboro 500 | Michigan International Speedway | Brooklyn, Michigan | August 2 | Mario Andretti | Unknown | Scott Goodyear | Walker Motorsport | Report |
| 11 | Budweiser Grand Prix of Cleveland | Cleveland Burke Lakefront Airport | Cleveland, Ohio | August 9 | Emerson Fittipaldi | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| 12 | Texaco/Havoline 200 | Road America | Elkhart Lake, Wisconsin | August 23 | Paul Tracy | Emerson Fittipaldi | Emerson Fittipaldi | Marlboro Team Penske | Report |
| 13 | Molson Indy Vancouver | Streets of Vancouver | Vancouver, British Columbia | August 30 | Michael Andretti | Emerson Fittipaldi | Michael Andretti | Newman/Haas Racing | Report |
| 14 | Pioneer Electronics 200 | Mid-Ohio Sports Car Course | Lexington, Ohio | September 13 | Michael Andretti | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| NC | Marlboro Challenge | Nazareth Speedway | Nazareth, Pennsylvania | October 3 | Michael Andretti | Unknown | Emerson Fittipaldi | Marlboro Team Penske | Report |
| 15 | Bosch Spark Plug Grand Prix | Nazareth Speedway | Nazareth, Pennsylvania | October 4 | Michael Andretti | Bobby Rahal | Bobby Rahal | Rahal-Hogan Racing | Report |
Question:
On how many dates did the Michigan International Speedway hold a round?
Answer:
1.0