Airline safety 'rankings' are always good to attract the casual reader, and not much else.
The truth is, without a deep study of the company's safety training and operational culture, they're pretty much useless.
Saying an airline is safe because it hasn't had an accident in a while is like saying someone has a healthy lifestyle because they don't have cancer. There is no direct link between the two.
Conversely, the more cynical amongst the statistical mathematician crowd would tell you that the longer since your last accident, the higher the chances the next one will happen soon...