RBI Percentage describes the rate at which a hitter drives in runs when he bats with men on base.

• While Miguel Cabrera outpaced Mike Trout by 56 RBI, the two were nearly identical in their percentage of RBI per opportunity at 43.88 percent and 43.07 percent, respectively.
• Garrett Jones and Andrew McCutchen combined for 182 of the Pirates’ 620 RBI, nearly 30 percent of the team’s total production.
• Miguel Cabrera and Prince Fielder combined for 247 of the Tigers’ 698 RBI, which is more than 35 percent.

• Cabrera did not lead our RBI Percentage list, but he was well clear of the field with 46 lead changing RBI.
• Adam Jones and Garrett Jones were the only two players in the top-10 with fewer than 90 total RBI.

• With so many opportunities to drive in runs, it is not a huge surprise that Miguel Cabrera also led baseball with 28 GIDPs.
• The top-nine hitters are all from the American League.

Four of the 10 leaders are catchers.

• Josh Hamilton’s extreme highs and extreme lows in 2012 may have something to do with his hyper-aggressiveness on the first pitch of each at-bat. From the beginning of the season through May, Hamilton hit .368 with 21 home runs. In June and July, he hit .202 with just eight home runs.
• The Nationals have three players—Ian Desmond, Danny Espinosa, and Bryce Harper—in the top-11. Patience at the plate is clearly not a priority for them.

Surprisingly, despite his low first-pitch swing percentage, J.J. Hardy only had a .282 on-base percentage in 2012. Every other player on this list had an on-base percentage at least 50 points higher (Teixeira second lowest at .332), each one of them significantly above MLB’s overall on-base percentage of .319.