I would have to say western and northern Europe. Over the last 20 years, they have been driven mainly by EU regulation. They really systematically work towards low-energy and energy-plus buildings, as they call them.
I can tell you, just as a matter of comparison, that our average home would use roughly, depending where you are, maybe 300 kilowatt hours per square metre per year. In some of the European countries with strong building envelopes and so on, they are getting them down to about 30 kilowatt hours per square metre, so there's a huge jump in innovation, and it continues to drive that usage down in the residential, institutional, and commercial sectors.