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:
| Institution | Location | Nickname | Founded | Type | Enrollment | Joined |
| --- | --- | --- | --- | --- | --- | --- |
| AIB College of Business | Des Moines, Iowa | Eagles | 1921 | Private | 1,000 | 2010 |
| Clarke University | Dubuque, Iowa | Crusaders | 1843 | Private/Roman Catholic | 1,230 | 19881 |
| Grand View University2 | Des Moines, Iowa | Vikings | 1896 | Private/Lutheran (ELCA) | 1,750 | 1989 |
| Mount Mercy University | Cedar Rapids, Iowa | Mustangs | 1928 | Private/Roman Catholic | 1,490 | 1988 |
| Saint Ambrose University | Davenport, Iowa | Fighting Bees (men's)\nQueen Bees (women's) | 1882 | Private/Roman Catholic | 3,623 | 1990 |
| Viterbo University | La Crosse, Wisconsin | V-Hawks | 1923 | Private/Roman Catholic | 2,991 | 1988 |
| William Penn University2 | Oskaloosa, Iowa | Statesmen (men's)\nLady Statesmen (women's) | 1873 | Private/Quaker | 1,550 | 2001 |
Question:
which two institutions joined the same year as clarke university?
Answer:
Mount Mercy University, Viterbo University