Argentina
Chile
Venezuela
Bolivia
Brazil
Colombia
Ecuador
Peru
Let's compare that to a map of South America:

Wow.
Maybe more interesting, under the circumstances: the South American countries that didn't make the list:
Guayana
Suriname
French Guiana
Paraguay
Uruguay.
Would not have predicted that. Anyone making a lot of patent filings in French Guiana?
BTW, also on the list of problem countries for IP:
Canada.
Go figure.