how many countries earned only one gold medal?
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col : rank | nation | gold | silver | bronze | total row 1 : 1 | puerto rico | 17 | 27 | 13 | 57 row 2 : 2 | bahamas | 17 | 15 | 19 | 51 row 3 : 3 | méxico | 9 | 9 | 5 | 23 row 4 : 4 | jamaica | 8 | 6 | 4 | 18 row 5 : 5 | barbados | 7 | 3 | 6 | 16 row 6 : 6 | trinidad and tobago | 7 | 2 | 2 | 11 row 7 : 7 | venezuela | 3 | 3 | 8 | 14 row 8 : 8 | colombia | 3 | 1 | 2 | 6 row 9 : 9 | u.s. virgin islands | 1 | 1 | 3 | 5 row 10 : 10 | martinique | 1 | 1 | 0 | 2 row 11 : 11 | antigua and barbuda | 1 | 0 | 1 | 2 row 12 : 12 | suriname | 1 | 0 | 0 | 1 row 13 : 13 | bermuda | 0 | 4 | 2 | 6 row 14 : 14 | dominican republic | 0 | 2 | 4 | 6 row 15 : 15 | panamá | 0 | 1 | 2 | 3 row 16 : 16 | cayman islands | 0 | 0 | 2 | 2 row 17 : 16 | saint kitts and nevis | 0 | 0 | 2 | 2
how many countries earned only one gold medal?
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
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