gdp growth?

I’m intrigued with this madness of perennial growth; I would like to ask to all CEOs: what is the purpose of keep on growing? And then if there is an ‘optimal size’ for their company. Thinking on this I combined in a graphic the GDP annual growth, GDP per capita and the HDI (Human Development Index). I was wondering: why countries like Norway or Switzerland would search growth when they already have the highest levels of income and human development? I’m not an economist and I may be naïve, but I just question my self this things and don’t see a justifiable answer. Access to raw data is available upon request.