The collapse of Arsenal’s defensive wall.

Our 2011/12 goals against of 49 was the worst defensive display we have experienced since we conceded the same amount 1994/5, however 1994/5 was a 42 game season so in terms of goals against per game 2011/12 was our worst ever in the EPL at 1.29 per game versus 1.17 in 1994/4.
To find a worse season one has to go back nearly 50 years to 1965/66 when we conceded 75 or 1.79 per game.
Our defensive vulnerability is not a recent occurrence and we are at our worst when we play away from home where the decline has been steady for the past nine seasons.
Here are the stats on our away goals against since 2003/4.
2003/4 = 12 GA, .63 Goals against per game.
2004/5 = 17 GA, .89 GPG
2005/6 = 18 GA, .95 ...