The recent concentrations of greenhouse gases can be found several places. Here is a link.
http://cdiac.ornl.gov/pns/current_ghg.html
(I don't believe that includes water vapor)
Seeing as they are measured in parts per million and parts per billion, the percentages are extremely low (as if we can't see through your ruse here). So next you'll argue how can something that makes up such a small portion of the atmosphere can be capable of such a large effect because you are largely ignorant towards the molecular properties of green houses gases to begin with. Its the type of thing that anyone in a 101 level college chemistry course will learn but you obviously don't have that education.
So go ahead. Make the argument. I'm waiting.