sentences:  Deliveries of the right-hand drive Vauxhall Ampera in the UK began in May 2012. , more than 33,000 units of the Volt/Ampera family have been sold worldwide.The United States is the world's top selling market with 19,309 Volts sold during the first ten months of 2012, and cumulative sales of 27,306 units since December 2010.The second best selling market is the Netherlands with 2,175 Amperas and 241 Volts sold through October 2012.