Here's the relative strength graph since '99:
Still, what he was asking is 'how strong' it was vs. the dollar, and a large part of strength is current trend. Over the last 4 years, the trend of the euro is strong vs. the USD (static-to-modest growth vs. other world currencies). A wise investor would take note that while some of euro's growth is due to solid fiscals on europe's part, it's also due to pisspoor performance of the greenback.
Here's a graph of euro's performance vs. world currencies:
