done it myself. Under wenger, goals conceded year on year

96/97 -32*
97/98 - 33
98/99 - 17*
99/00 - 43??
00/01 - 38
01/02 - 36
2/3 - 42
3/4 - 26*
4/5 - 36
5/6 - 31
6/7 - 35
7/8 - 31
8/9 - 37
9/10 - 41
10/11 - 43

* means lowest in the league

Last 4 years have increased year on year as well...