The answer you want is about 70%.
about one-quarter of the worlds freshwater
The two polar ice caps contain about 68.7% of the Earth's freshwater supply. The ice in Antarctica holds around 61% of the world's fresh water, while the ice in the Arctic region holds about 7.7%.
Lake Baikal Is the worlds largest freshwater lake
About 70% of the world's freshwater is used in farming.
Lake Tanganyika
No
Total Renewable Freshwater Supply, by CountryRegion and Country---Annual Renewable Water Resources (km3/yr)#1.Brazil 8233.0#2.Russia 4498.0#3.Canada 3300.0Sources: The World's Water 2006-2007 Tables, Pacific Institute
Niagara falls
less than 0.1%
true
The Great Lakes contain about 84% of North America's surface freshwater supply, which is roughly 21% of the world's surface freshwater supply.