Useful analysis on international markets versus domestic for animated sequels with county by country breakdown. And the emergence of an interesting trend. It seems non-US audiences are more loyal than their fickle US counterparts:
"For many big-budget, non-sequel animated features, North America delivers around 50% of the total global box revenue.
By the third or fourth film, the domestic grosses fall off but the foreign numbers keep growing. This is what happened with Shrek, Madagascar and Cars, and now the same phenomenon has occurred with Despicable Me."