I went through PFR's list of box score data for every regular season game played in the 2009 season, and compiled the following tallies:
| Unit | Type | # | Points | Total |
| Offense | Passing TD | 711 | 4266 | |
| Rushing TD | 428 | 2568 | ||
| 2-point conversion | 24 | 48 | 6882 | |
| Defense | Pick-6 | 48 | 288 | |
| Fumble-6 | 26 | 156 | ||
| Safety | 14 | 28 | 472 | |
| Special | Field goals | 756 | 2268 | |
| Teams | Extra points | 1163 | 1163 | |
| Kickoff return | 18 | 108 | ||
| Punt return | 10 | 60 | ||
| Blocked punt return | 4 | 24 | ||
| Blocked FG return | 2 | 12 | 3635 | |
| Total | 10989 |
Comments:
PFR's data seems to be mostly OK, although there are some obvious errors. This game, for example, has a touchdown being scored on a "-21 yard fumble return".
All passing and rushing touchdowns are credited to the offense, even though there was at least one scored by special teams. There's no reliable way to tell when a touchdown is scored on special teams using PFR's score format.
Another deficiency of PFR's score format: when a conversion attempt fails after a touchdown, it doesn't indicate whether it was an extra point try (and whether it was a bad snap, a bad kick, or a block), or whether it was a 2-point try.
There were 60 failed conversions. According to this article [nytimes.com], there were 53 2-point conversion tries this season, which means that 29 failed 2-point conversions and 31 failed extra points.
That gives a 97.6% success rate for extra points, and a 45.3% success rate for 2-point conversions. That may not seem like much, but getting 2 points on success doubles the effectiveness (for an extra point, expected value is .976, for a 2-point conversion, expected value is .906). Of course, that's over the course of a season for 32 teams. Which doesn't always help in one game, one team, one play, for a single good-or-bad outcome.
I've said before I'm generally not a big fan of 2-point conversions; I was actually rather surprised by how infrequently they were attempted (53 tries/1163 TDs = 4.6% of the time).
I was also surprised by how low the defensive scoring was compared to offense and special teams. As important as a defensive score can be to the course of a game, in terms of total points scored, it's pretty minor.
More scoring data coming as soon as I get the box score information parsed out to a more convenient format.
