LONDON, England – More and more young adults living with their parents are partly to blame for the jump in the number of households with four or more cars. It's up by more than half since 2000. The London Daily Mail also reported that the growing number of working women was a factor.Nearly 2.6-million more women have a driving licence than than 15 years earlier – almost double the rise in the number of male drivers.SIGNIFICANT GROWTHNearly one in 50 families in the UK now share one house but four cars, according to an analysis of 2011 UK census data done for the Mail by the RAC Foundation. The number of households with three cars is up by nearly a third; two-car families have increased by 13% and overall the number of households with two or more cars is up by nearly 20%However, an assessment showing the number of cars per 1000 people reveals that the proportion of households without a car has fallen by 4.5%, the Mail reported.The foundation compared 2001 census data with that of 2011 and found that 7.5-million households in England and Wales now have two or more cars, 18% more than in 2001, and the number of two-car households has risen 13.3% to nearly 5.78-million.The number of three-car families has risen 31.5% to 1.28million and the number of households with four or more cars has soared 51.3% to 453 190.How many cars does your family have? Tell us in the Readers' Comments section below or email Wheels24.