The ECB has left interest rates unchanged for two years now. During the past few months, it has repeatedly hinted at the possibility of increasing interest rates to fend off inflationary risks from high growth figures for M3 money supply and for asset price bubbles in some euro-zone countries. Rising housing prices, particularly in some southern euro-zone countries, suggested the possibility that an asset price bubble is building up. The ECB acknowledged these concerns by lowering its staff projections for 2005 and 2006 gross domestic product growth in the euro zone, but at the same time said it remains bound only by its main objective of securing price stability. "We are responsible (for maintaining price stability), nobody else," Trichet said after the last ECB meeting, adding that the ECB's decision to keep interest rates unchanged was made unanimously.