Which one of the following is the correct percentage of the two...

The gases, which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called green-house gases. Recently, the concentration of green-house gases has started rising resulting in enhanced green-house effect that is resulting in increase the mean global temperature. It is called global warming. The various green house gases are $\mathrm{CO}_2$ (warming effect $60 \%), \mathrm{CH}_4(20 \%)$, CFCs (14\%) and nitrous oxide- $\mathrm{N}_2 \mathrm{O}(6 \%)$.