It's always a good idea to have up to date and recent statistics and examples, which I would classify as the past 1-2 years, but often, it can be good to analyse economic activity in terms of pre-GFC, during GFC and recovery up till now. For example, in looking at the resources boom, we can look at each of these three phases to see how international trade flows, and demand patterns, have changed over time, rather than simply discussing recent developments, which doesn't give the fullest picture of economic activity in the global economy.
Another example would be when talking about economic policies, which can change over time, and a question which asks you to discuss different policy options would require examining past policies and contrasting them to recent ones. Basically, don't feel like everything has to be recent, and it's okay to talk about non-recent events, as long as you can show the relevance to the question.