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 | Nation | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- |
| 1 | Puerto Rico | 17 | 27 | 13 | 57 |
| 2 | Bahamas | 17 | 15 | 19 | 51 |
| 3 | México | 9 | 9 | 5 | 23 |
| 4 | Jamaica | 8 | 6 | 4 | 18 |
| 5 | Barbados | 7 | 3 | 6 | 16 |
| 6 | Trinidad and Tobago | 7 | 2 | 2 | 11 |
| 7 | Venezuela | 3 | 3 | 8 | 14 |
| 8 | Colombia | 3 | 1 | 2 | 6 |
| 9 | U.S. Virgin Islands | 1 | 1 | 3 | 5 |
| 10 | Martinique | 1 | 1 | 0 | 2 |
| 11 | Antigua and Barbuda | 1 | 0 | 1 | 2 |
| 12 | Suriname | 1 | 0 | 0 | 1 |
| 13 | Bermuda | 0 | 4 | 2 | 6 |
| 14 | Dominican Republic | 0 | 2 | 4 | 6 |
| 15 | Panamá | 0 | 1 | 2 | 3 |
| 16 | Cayman Islands | 0 | 0 | 2 | 2 |
| 16 | Saint Kitts and Nevis | 0 | 0 | 2 | 2 |
Question:
how many countries earned only one gold medal?
Answer:
4