Funny thing in terms of ticket sold in NA
Its
SS
GOF
DH2
COS
OOTP
HBP
POA
DH1
http://boxofficemojo.com/alltime/adjusted.htm?adjust_yr=1&p=.htm
It appears what happened is GOF appears to have been not well liked by HP fans but well liked by general audiences.
Likely as it was the action pakced