I'm not gonna argue the answer or the question, I'll just state what I thought. So feel free to ignore this post.
When you say 'Who won the championship this year" obviously means the latest championship. "Last year" to me sounds like you would be asking for the one that happen approximately a year ago, not 3 months ago. Going on that logic, three years would be approx. 3 years ago, not three seasons or 3 championships.
Besides, how can a team that has won 4 championships in the past 11 years bad? That's not including the numerous playoff appearances they've made.
Oh well, on to the next question.