Wondering what percentage of Latinas are only with their gringo boyfriends / spouses to get a visa for the US, Europe, Australia, etc.

Wondering what percentage of Latinas are only with their gringo boyfriends / spouses to get a visa for the US, Europe, Australia, etc.
SUMMARY: A look at Joran van der Sloot & William Trickett Smith II, plus prison for gringos in Latin America.