The suicide rates by nation in the article are likely higher than reported. I lost a sibling to what I believe was suicide but it was recorded as an accident. I also think under-reporting happens more in countries where there is a stigma against it. Nations with a high Catholic population in particular may under-report (my parents being Catholic would never accept suicide as a cause of death for their daughter). Suicide is viewed as a sin and many Catholics believe it leads to hell.

Also interesting is that many of the countries listed as having the lowest suicide rates are also the most Catholic according to wikipedia (Phillipines, Brazil, Mexico and Italy).