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:
| Rank | Name | Nationality | Time |
| --- | --- | --- | --- |
|  | Jorge Delgado | Ecuador | 1:55.45 |
|  | Rick DeMont | United States | 1:55.96 |
|  | Rex Favero | United States | 1:57.08 |
| 4 | Djan Madruga | Brazil | 1:57.17 |
| 5 | - | - | - |
| 6 | - | - | - |
| 7 | - | - | - |
| 8 | - | - | - |
Question:
how many ranked swimmers were from the united states?
Answer:
2