 The Prius liftback is the top-selling model with 1,812,800 units, followed by the Aqua with 1,154,500 units, the Prius α with 446,400, and the Prius plug-in with 22,100.Cumulative sales of Honda's hybrid vehicles since November 1999 reached 25,239 units by January 2009, and in March 2010, Honda announced that the new 2010 Insight broke through 100,000 sales in Japan in just one year after its introduction.Hybrid sales in Japan almost tripled in 2009 as compared to 2008 as a result of government incentives that included a scrappage program, tax breaks on hybrid vehicles and other low-emission cars and trucks, and a higher levy on gasoline that rose prices in the order of US$4.50.