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Main Mariner page at b-ref is here: http://www.baseball-reference.com/teams/SEA/2014.shtml
Next to the red "Team Pitching" tab is a blue "More Stats" tab.  That takes you here: http://www.baseball-reference.com/teams/SEA/2014-pitching.shtml
Scroll down to "Team Relief Pitching" and about midway you'll see IR | IS | IS%
Back up at the top of the stat tables you'll find "2013 Pitching Statistics" and where it applies the year before and the year after will always be clickable there -- so you can easily go backward and forward in time getting the same page of stats.
M's are at 31% this year and were at 33% last year.
Some columns have the league average, but those columns don't.  Turns out the average in 2013 was 29%, which you find here: http://www.baseball-reference.com/leagues/MLB/2013-reliever-pitching.shtml
So they were in the bottom third in that category last year, but are pretty much in the middle this year.