The Jacksonville Jaguars have what appears to be a historically dominant defense this year (more on this later in the week). But here’s a simple way to look at it: Jacksonville is allowing just 8.0 points per game in wins this season, and has won just one game where it allowed more than 10 points. The Ravens have had a similar run of success (3 of the team’s 7 wins have come in shutouts) and the Giants have won just two games (but the defense played well in both); the other teams have all allowed an average of 13 points per game or more in wins. You can see how many points each team has allowed in wins and losses this season here.

But I think we are all a bit surprised to see a Blake Bortles led team sport an 8-4 record, and it would hardly be surprising to see the Jaguars win 10 or 11 games this year (Houston and San Francisco are still on the schedule). So when we look back and say how the heck did this happen, well, obviously the defense dominating in wins played a huge role. How huge?

Among quarterbacks since 1950 to win at least 6 games in a season, only 58 played on teams that allowed fewer than 10 points per game in wins. Of those 58, 13 played between 1950 and 1969, another 16 played from 1970 to 1977, and another 9 played from 1978 to 1989.

That means just 20 played from 1990 to 2016, and only 8 from 2002 to 2016. That’s about one every two years, and right now, Bortles and Joe Flacco are poised to join the list. When you look back and see that Kyle Orton once won 10 games, or Mark Sanchez had a winning record, or a 37-year-old Jeff Garcia went 8-5, well, this list helps clarify things.

What stands out to you?