Electricity/Oil/Propane to Heat Pump conversion

There's an interesting discussion going on about Heat Pumps now. So I wonder if anybody out there has actually switched from Electricity, Oil/Propane, and can give good comparative figures from their personal experience. What I would like to see are the ANNUAL energy consumptions (in Litres for oil/gas, and Kwh for elec) before the change, and the same figures for after. Making any other changes (Insulation, solar panels, etc) would nullify the comparison, I'm afraid .

I would be equally curious, as we are considering changing our ancient oil fired boiler for the air to water heat pump system.