Looked at the numbers of earned vs unearned runs from season 5.
In Morgan World the average team 89% of the scored runs were earned runs. I used the method of each team's average instead of all combined runs vs. unearned runs because that would lend more weight to teams that gave up more total runs. This way everyone has 1/32 of a say in the league total.
In MLB this season 91% of the runs scored were earned runs.
Morgan world teams varied from a high of 92% to a low of 84%, there were a number around the 91-92% mark.
MLB teams varied from a high of 95% to a low of 87%. Only one team had 94%.