Mathis takes down Manning.

Since the sack became an official statistic in 1982, the record for percentage of team sacks by an individual player was set by right outside linebacker Tim Harris on the 1989 Packers. Green Bay ran a 3-4 defense under Hank Bullough, and Harris had 19.5 of the team’s 34 sacks.  That means 57.4% of all sacks by Packers players that year came from Harris; no other Green Bay player had more than three sacks.

Aldon Smith had 19.5 sacks, too, playing on the 2012 49ers. Last year, San Francisco recorded 38 team sacks, meaning Smith — playing that same ROLB position in the 3-4 defense — had 51.3% of his team’s sacks.  Two other players recorded exactly half of their team’s sacks.  In 1984, when Mark Gastineau (playing at left defensive end in New York’s 4-3 defense) set the sack record, he recorded 22 of the Jets 44 total sacks. Fifteen years later, Football Perspective All Underrated star Simeon Rice (who lined up at right defensive end) had 16.5 of the Cardinals 33 sacks.

Mathis was a star 4-3 defensive end, but he’s already matched his single-season career high in sacks. He’s having perhaps his best season playing as rush linebacker in the system devised by Greg Manusky and Chuck Pagano. And his numbers look even better as a percentage of team sacks. Below are the top 50 leaders from 1982 to 2012 in percentage of team sacks, which is a cut-off deep enough to bring in another Robert Mathis season:

Rice and John Abraham are the only players who made the top-50 four times; that may be a good argument to bolster the resumes of two borderline Hall of Fame players. Harris was no one-year wonder, either: he’s on the list two other times. The only other players to appear three times are Bruce Smith and Kevin Greene. Other than Smith, only four other times did a 3-4 defensive end make the list, while other than Greene, just twice did a 3-4 left outside linebacker appear.

J.J. Swatt.

The tables below show the single-season leaders by various defensive players in 3-4 and 4-3 schemes from 1982 to 2011.

Let’s start with a look at the most sacks by a 3-4 defensive end:

As you can imagine, 3-4 defensive linemen don’t rack up many sacks. Bill Pickel, a nose tackle for the Raiders in the ’80s, recorded 12.5 sacks in both ’84 and ’85, making him the only 3-4 tackle to record more than 12 sacks in a season. Karl Mecklenburg, with 13 sacks for the Broncos in ’85, remains the only inside linebacker in a 3-4 with more than a dozen sacks.

Of course, 3-4 outside linebackers get all the glory in that scheme. San Francisco’s Aldon Smith has 19.5 sacks so far in 2012 with two games remaining, but here were the leaders prior to 2012:

What about 4-3 defensive ends?

And 4-3 defensive tackles:

4-3 outside linebackers rarely rack up huge sack numbers. In fact, Denver’s Von Miller, who has 16 sacks this year, is already the record holder in the official sack era. Derrick Thomas (14.5 sacks in 1992, 13 in 1996) in Kansas City, Washington’s Ken Harvey (13.5 in ’94) and Cleveland’s Jamir Miller (13 in ’01) are the only other 4-3 outside linebackers with more than twelve sacks in a season since 1982. (Of course, Thomas also had a 20-sack season a 3-4 outside linebacker.) Charlie Clemons, with 13.5 sacks in 2001, is the record holder among 4-3 middle linebackers.