edit : didn't mentioned that the interest i saw with the graph above was that it's usually considered cheaper to work in China, and that developing countries need to 'be competitive'/'lower their salaries' in order to attract investments. This graph points out to the existence of other factors than wages in order to 'be competitive'/'attract investments'. Perhaps that a country should( somehow) become wealthy enough to enable its own capitalists to invest in machinery, leading to 'higher salaries'/'more (productive )investments'/'higher competitiveness', i.d.k. Still don't know as well how China escaped the trap that every other country fell in.
Re Mexico, It wasn’t always like this, but that’s what exploitation will do to a country.
https://data.oecd.org/earnwage/average-wages.htm
Real wages in Mexico has not increased. And has actually decreased a bit since 2008.
Edit: you can also find ppp adjustment values on the OCAD website to adjust these wages yourself.