Very interesting summary about how NZ has peeformed this year in matches involving yellow cards:

http://www.nzherald.co.nz/rugby/news/article.cfm?c_id=80&objectid=11356074
To summarise: After losing a player to the sin bin NZ have only conceded more points than they have scored in those ten minutes in two of seven instances (both in the same match, the draw with the Wallabies). The points tally during All Blacks sin bin periods is 27-9.

If we extrapolated this out, that would be one point every 3.9 minutes, approximately 31 points a match - a quarter of a point less than what they have scored on average this year! If you take out the periods where NZ had yellow cards, you'd see that they actually score more points on average with 14 men than with 15. If you remove the USA game the result becomes even more comprehensive (27 points per game, on average, including periods where NZ had only 14 men on the field).

In contrast, when playing against 14 players the All Blacks have outscored their opponents 39-3 (four instances, meaning almost a point a minute!).

Fun facts!