I'm not sure how to pick up league average runs per game through certain dates or number of games into the year. however, it is easy to pick up runs / game here.
http://www.baseball-reference.com/leagues/NL/bat.shtmlIt's whole season numbers, but, since 2005 in the NL, Runs/game is:
2005 - 4.45
2006 - 4.76
2007 - 4.71
2008 - 4.54
2009 - 4.43
2010 - 4.33
2011 - 4.13
2012 - 4.06
80 runs in 24 games is 3.33. Still stinks, but is 82% of league average for the whole season.
2007, i think, was 78 runs (3.25 /g). Relative to league average for the whole season, that was 69%. Progress!
2008 was 93, or 3.875, or 85% of league full season average. Eyeballing it, that would be the only one close to this year.