Some research I did on water:
Water covers 71% of the Earth's surface. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation.
1.6% of water below ground in aquifers, thats how I came up with onepointsix
another idea was 1.6% of earth, but people might not think of water with the prosent.
(This comment references Entry #444)