If you assume these are reasonably good estimates of historical emissions, you can apply those percentages to the appropriate radiative forcings. (realclimate.org)
First, let's look at historical emissions of CO2 from man - made sources from 1850 to 2010. (critical-angle.net)
Of course, it's also possible to look at historical emissions per person, which turns things around yet again. (theguardian.com)