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:
| Date | Site | Winning team | Winning team | Losing team | Losing team | Series |
| --- | --- | --- | --- | --- | --- | --- |
| 1959 | Ames | Missouri | 14 | Iowa State | 0 | Missouri 30–16–6 |
| 1960 | Columbia | Missouri | 34 | Iowa State | 8 | Missouri 31–16–6 |
| 1961 | Ames | Missouri | 13 | Iowa State | 7 | Missouri 32–16–6 |
| 1962 | Columbia | Missouri | 21 | Iowa State | 6 | Missouri 33–16–6 |
| 1963 | Ames | Missouri | 7 | Iowa State | 0 | Missouri 34–16–6 |
| 1964 | Columbia | Missouri | 10 | Iowa State | 0 | Missouri 35–16–6 |
| 1965 | Ames | Missouri | 23 | Iowa State | 7 | Missouri 36–16–6 |
| 1966 | Columbia | Missouri | 10 | Iowa State | 10 | Missouri 36–16–7 |
| 1967 | Ames | Missouri | 23 | Iowa State | 7 | Missouri 37–16–7 |
| 1968 | Columbia | Missouri | 42 | Iowa State | 7 | Missouri 38–16–7 |
| 1969 | Ames | Missouri | 40 | Iowa State | 13 | Missouri 39–16–7 |
| 1970 | Columbia | Iowa State | 31 | Missouri | 19 | Missouri 39–17–7 |
| 1971 | Ames | Iowa State | 45 | Missouri | 17 | Missouri 39–18–7 |
| 1972 | Columbia | Missouri | 6 | Iowa State | 5 | Missouri 40–18–7 |
| 1973 | Ames | Iowa State | 17 | Missouri | 7 | Missouri 40–19–7 |
| 1974 | Columbia | Missouri | 10 | Iowa State | 7 | Missouri 41–19–7 |
| 1975 | Ames | Missouri | 44 | Iowa State | 14 | Missouri 42–19–7 |
| 1976 | Columbia | Iowa State | 21 | Missouri | 17 | Missouri 42–20–7 |
| 1977 | Ames | Iowa State | 7 | Missouri | 0 | Missouri 42–21–7 |
| 1978 | Columbia | Missouri | 26 | Iowa State | 13 | Missouri 43–21–7 |
| 1979 | Ames | Missouri | 18 | Iowa State | 9 | Missouri 44–21–7 |
| 1980 | Columbia | Missouri | 14 | Iowa State | 10 | Missouri 45–21–7 |
| 1981 | Ames | Iowa State | 34 | Missouri | 13 | Missouri 45–22–7 |
| 1982 | Columbia | Iowa State | 17 | Missouri | 17 | Missouri 45–22–8 |
| 1983 | Ames | Missouri | 41 | Iowa State | 18 | Missouri 46–22–8 |
| 1984 | Columbia | Iowa State | 14 | Missouri | 14 | Missouri 46–22–9 |
| 1985 | Ames | Missouri | 28 | Iowa State | 27 | Missouri 47–22–9 |
| 1986 | Columbia | Iowa State | 37 | Missouri | 14 | Missouri 47–23–9 |
| 1987 | Ames | Missouri | 42 | Iowa State | 17 | Missouri 48–23–9 |
| 1988 | Columbia | Iowa State | 21 | Missouri | 3 | Missouri 48–24–9 |
| 1989 | Columbia | Iowa State | 35 | Missouri | 21 | Missouri 48–25–9 |
| 1990 | Ames | Iowa State | 27 | Missouri | 25 | Missouri 48–26–9 |
| 1991 | Columbia | Iowa State | 23 | Missouri | 22 | Missouri 48–27–9 |
| 1992 | Ames | Iowa State | 28 | Missouri | 14 | Missouri 48–28–9 |
| 1993 | Columbia | Missouri | 37 | Iowa State | 34 | Missouri 49–28–9 |
| 1994 | Ames | Missouri | 34 | Iowa State | 20 | Missouri 50–28–9 |
| 1995 | Columbia | Missouri | 45 | Iowa State | 31 | Missouri 51–28–9 |
| 1996 | Ames | Iowa State | 45 | Missouri | 31 | Missouri 51–29–9 |
| 1997 | Columbia | Missouri | 45 | Iowa State | 21 | Missouri 52–29–9 |
| 1998 | Ames | #21 Missouri | 35 | Iowa State | 19 | Missouri 53–29–9 |
| 1999 | Columbia | Iowa State | 24 | Missouri | 21 | Missouri 53–30–9 |
| 2000 | Ames | Iowa State | 39 | Missouri | 20 | Missouri 53–31–9 |
| 2001 | Columbia | Iowa State | 20 | Missouri | 14 | Missouri 53–32–9 |
| 2002 | Ames | #22 Iowa State | 42 | Missouri | 35 | Missouri 53–33–9 |
| 2003 | Columbia | Missouri | 45 | Iowa State | 7 | Missouri 54–33–9 |
| 2004 | Ames | Missouri | 17 | Iowa State | 14 | Missouri 55–33–9 |
| 2005 | Columbia | Missouri | 27 | Iowa State | 24 | Missouri 56–33–9 |
| 2006 | Ames | Iowa State | 21 | Missouri | 16 | Missouri 56–34–9 |
| 2007 | Columbia | #13 Missouri | 42 | Iowa State | 28 | Missouri 57–34–9 |
| 2008 | Ames | #11 Missouri | 52 | Iowa State | 20 | Missouri 58–34–9 |
| 2009 | Columbia | Missouri | 34 | Iowa State | 24 | Missouri 59–34–9 |
| 2010 | Ames | #15 Missouri | 14 | Iowa State | 0 | Missouri 60–34–9 |
| 2011 | Columbia | Missouri | 52 | Iowa State | 17 | Missouri 61–34–9 |
Question:
how many times did iowa state win in the 21st century?
Answer:
4