|Year|Driver|Nation of citizenship|Racing series|Type of vehicle|
|---|---|---|---|---|
|1993|Nigel Mansell|United Kingdom|Formula One|Open wheel|
|1994|Nigel Mansell|United Kingdom|CART|Open wheel|
|1995|Al Unser, Jr.|United States|CART|Open wheel|
|1996|Jeff Gordon|United States|NASCAR|Stock car|
|1997|Jimmy Vasser|United States|CART|Open wheel|
|1998|Jeff Gordon|United States|NASCAR|Stock car|
|1999|Jeff Gordon|United States|NASCAR|Stock car|
|2000|Dale Jarrett|United States|NASCAR|Stock car|
|2001|Bobby Labonte|United States|NASCAR|Stock car|
|2002|Michael Schumacher|Germany|Formula One|Open wheel|
|2003|Tony Stewart|United States|NASCAR|Stock car|
|2004|Dale Earnhardt, Jr.|United States|NASCAR|Stock car|
|2005|Michael Schumacher|Germany|Formula One|Open wheel|
|2006|Tony Stewart|United States|NASCAR|Stock car|
|2007|Jeff Gordon|United States|NASCAR|Stock car|
|2008|Jimmie Johnson|United States|NASCAR|Stock car|
|2009|Jimmie Johnson|United States|NASCAR|Stock car|
|2010|Jimmie Johnson|United States|NASCAR|Stock car|
|2011|Jimmie Johnson|United States|NASCAR|Stock car|
|2012|Tony Stewart|United States|NASCAR|Stock car|
|2013|Ryan Hunter-Reay|United States|IndyCar Series|Open wheel|

Question: how many total row entries are there?
Answer: 21