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:
| Team | Titles | Runner-up | Third place | Fourth place | Years participated |
| --- | --- | --- | --- | --- | --- |
| Michigan | 15.0 | 13.0 | 10.0 | 5.0 | 43.0 |
| Michigan State | 12.0 | 13.0 | 10.0 | 4.0 | 39.0 |
| Michigan Tech | 10.0 | 12.0 | 10.0 | 16.0 | 48.0 |
| North Dakota | 2.0 | 1.0 | 0.0 | 1.0 | 4.0 |
| Toronto | 1.0 | 0.0 | 0.0 | 0.0 | 1.0 |
| New Hampshire | 1.0 | 0.0 | 1.0 | 0.0 | 2.0 |
| Colorado College | 1.0 | 1.0 | 0.0 | 1.0 | 3.0 |
| Western Michigan | 1.0 | 1.0 | 0.0 | 1.0 | 3.0 |
| Wisconsin | 1.0 | 1.0 | 1.0 | 0.0 | 3.0 |
| Boston College | 1.0 | 0.0 | 3.0 | 0.0 | 4.0 |
| Notre Dame | 1.0 | 0.0 | 0.0 | 3.0 | 4.0 |
| Boston University | 1.0 | 0.0 | 4.0 | 0.0 | 5.0 |
| Harvard | 1.0 | 0.0 | 2.0 | 2.0 | 5.0 |
| Maine | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 |
| Ohio State | 0.0 | 1.0 | 0.0 | 0.0 | 1.0 |
| Rensselaer Polytechnic Institute | 0.0 | 2.0 | 0.0 | 0.0 | 2.0 |
| Lake Superior State | 0.0 | 1.0 | 1.0 | 1.0 | 3.0 |
| Northern Michigan | 0.0 | 1.0 | 2.0 | 2.0 | 5.0 |
| Colgate | 0.0 | 0.0 | 1.0 | 0.0 | 1.0 |
| Dartmouth | 0.0 | 0.0 | 1.0 | 0.0 | 1.0 |
| Providence | 0.0 | 0.0 | 1.0 | 0.0 | 1.0 |
| Brown | 0.0 | 0.0 | 1.0 | 1.0 | 2.0 |
| Cornell | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| Princeton | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| St Lawrence | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| Yale | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| Bowling Green | 0.0 | 0.0 | 0.0 | 2.0 | 2.0 |
| Pennsylvania | 0.0 | 0.0 | 0.0 | 2.0 | 2.0 |
Question:
How many years did notre dame participate? 
Answer:
4.0