According to the index, Chile got rated 7.2, the highest in all of LATAM, followed closely by Uruguay. Actually two two countries lead the whole region by an absurdly large margin.
Remember that the index shows levels of "perceived" government corruption, not actual corruption. Still, it seems that Chileans have a pretty decent image of their public institutions. Based on my brief experience there, this perception seems justified.
On the other hand, I was surprised that Brazil ranked as high as 3.8. I thought the perception there would have been more negative.