I don't know if that statistic is tracked or not. When my agency switched from MDTs to laptops, it took approximately 2-3 weeks to become a decent typist with one hand. The keyboards now have nubs that make it easy to find where your hand is and many agencies have audible tones when something shows up. Typing with one hand without looking at the keyboard is very easy and reviewing what was typed takes less than a second (about as long as it takes to look to locate a radio knob), once you are proficient with the system layout.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.