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:
| Club | League | Sport | Venue | Established | Championships |
| --- | --- | --- | --- | --- | --- |
| Madison Mustangs | IFL | American football | Breitenbach Stadium | 1997 | 4 consecutive Ironbowls |
| Madison Mallards | NL | Baseball | Warner Park | 2001 | 1 championship |
| Madison 56ers | NPSL | Soccer | Breese Stevens Field | 2005 | 0 championships |
| Wisconsin Rugby Club | WRFU | Rugby | Wisconsin Rugby Club Sports Complex | 1962 | 2 championships |
| Madison Minotaurs | WRFU | Rugby | Yahara Rugby Field | 2007 | 0 Bingham Cups |
| Wisconsin Badgers | Big Ten, NCAA Div.1 | 23 Varsity Teams | Camp Randall Stadium, Kohl Center | 1849 | 27 championships |
| Edgewood Eagles | NACC, NCAA Div.3 | 16 varsity teams | Edgedome | 1974 | 35 championships |
| Madison College Wolfpack | N4C, NJCAA Div.3 | 8 varsity teams | Redsten Gymnasium, Roberts Field | 1912 | 21 championships |
| Mad Rollin' Dolls | WFTDA | Roller derby | Alliant Energy Center | 2005 | 0 championships |
| Madison Blues | GLHL | Hockey | Capitol Ice Arena | 2010 | 0 championships |
Question:
how many current teams have been in existence for 25 years or greater?
Answer:
4