While the economic weight of the new Member States is, at the current stage, less significant - their total GDP as a share of the existing members is about 5% (at market exchange rates, as compared with around 8% of the EU GDP when Spain and Portugal joined the EU in 1986), this will change in the future as their per-capita income levels are catching up with those in the rest of the EU.
In contrast to Australia, economic activity in New Zealand contracted during the Asian crisis in the late 1990s, and the US subprime mortgage crisis of the late 2000s that snowballed into the GFC.