Again, someone can look it up if they choose, but Ruth had a WAR over 13 for four seasons. If Trout finishes above 13 this year, it seems a cinch to carry over the trend for at least 3 more seasons.
Consider that he will mostly likely win another MVP, so that will be 3 MVPs in 5 years, with the other two as runner up. IOW, the only fair comparison to Trout is Ruth.