What percentage of car accidents are caused by mobile phone's?

in the united states, about 1200 injury causing wrecks PER DAY due to an avoidable distraction. 20% of those wrecks are due to distraction by cell phone usage, which means 448,000 wrecks due to an avoidable distraction over the course of the year. 89,600 of those wrecks were due to a cell phone; 5,474 deaths last year (2009) due to an avoidable distraction and 995 of those deaths were due to cell phones. These numbers keep rising each year. So this answer will need to be updated continuously.