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Gases in air are nitrogen about 79%, oxygen about 20% and other gases 1%
Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
The answer depends on what you are trying to do with the percentages.
An Actuary.
Any graph can use percentages.
i don't know the percentages but i do know that hydrogen and helium are the 2 main gases! sorry this did not completely answer the question:(
oxygen
Go to images.google.com and search for gases in the atmosphere.
Nitrogen (about 78%) and oxygen (about 21%).
Gases in air are nitrogen about 79%, oxygen about 20% and other gases 1%
line graph
Most people work with percentages in one way or another.
Cirle Graph.
Nitrogen - 78% Oxygen - 21% Carbon Dioxide - 0.04% Noble gases - 0.96%
Ambient air is about 21% Oxygen, 78% Nitrogen and 1% Mixed Gasses. Our body uses about 4% Oxygen to stay alive so what comes out is 17% Oxygen and 4% Carbondioxide.
The inner core of Earth contains Iron and Nickel. I do not know the percentages of each gas.
It is simpler because the amount of water vapor in the air can change.