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 | 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