what is the total of athletes from the united states?
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col : rank | name | nationality | time row 1 :  | joanne malar | canada | 4:43.64 row 2 :  | alison fealey | united states | 4:48.31 row 3 :  | jenny kurth | united states | 4:57.24 row 4 : 4 | sonia fonseca | puerto rico | 5:03.15 row 5 : 5 | fabíola molina | brazil | 5:03.43 row 6 : 6 | isabel rojas | colombia | 5:11.58 row 7 : 7 | carolyn adel | suriname | 5:13.24 row 8 : 8 | edith arraspide | argentina | 5:13.95
what is the total of athletes from the united states?
Rank Name Nationality Time
Joanne Malar Canada 4:43.64
Alison Fealey United States 4:48.31
Jenny Kurth United States 4:57.24
4 Sonia Fonseca Puerto Rico 5:03.15
5 Fabíola Molina Brazil 5:03.43
6 Isabel Rojas Colombia 5:11.58
7 Carolyn Adel Suriname 5:13.24
8 Edith Arraspide Argentina 5:13.95
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