In case people were wondering about the x-axis:
LPA = laks (in Indian rupees [IDR]) per annum
1 laks IDR = 1.3k USD = 1.1k EUR = 0.98k GBP
The right most tick on the axis, 70 LPA, is about 94k USD/year.
It seems that the developer wages in India are higher than much of SE Asia.