How can I export the number of pixels of each layer into an excel file?

I would like to export the number of pixels that each layer of an image contains into excel. How can I do this?
Secondly, as I need to do this with several images, is there any way to name the layers so that all layers with let's say for example the name "yellow" appear in the same column in excel?
Some background information on why I need to do this... I would like to know how many percent of an image are yellow and have therefore created  layers of one image for each color it contains.
Thanks for your help!!!

Maybe my question was a bit unclear. I do not want to find out the number of pixels of a color in a layer but the number of pixels of the complete layer.
What color these layers are is a different question. I am using images with a very limited range of colors (sort of like the image above but with about 10 colors). I have seperated these colors into layers and now need to count the pixels of each layer and export them.
You can record number of pixels/layer  into the Measurement Log, then export data to Excel. But I'm not sure how to automate that without scripting.
Does anyone know how to do this?
For normal artLayers it is somewhat easy to get the number of pixels in the layer. But that is just how many pixels are in the layer.
But that is exactly what I need to know, how many pixels are in the layer. I know how to find this out by looking at the histogram of the selection. But I want to export this information of all layers at once into an excel or text file. Any ideas on how to automate this with or without scripting?
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