New York, January 3 - US sales of the Fiat 500 mini car jumped by 50% in December and by 121% over the full year, the Turin-based company said Thursday. The December figures for the Fiat brand - which only sells the 500 under its brand badge in North America - was the best for all group brands in that market and marked the 10th consecutive month of record sales. Fiat also controls Chrysler and its Dodge and Jeep brands. In terms of models, the 500 saw sales jump 64% compared with December 2011, while sales of the convertible increased 39% on the year-earlier month. For the whole year, 500 sales reached 43,772 units, up 121% on 2011. Sales of the 500 in the US, Canada and Mexico topped 50,000 units in 2012. In 2011, the 500 was sold only for 10 months, from its launch in March to the end of the year.