Apparently those large provinces where Tibetans and Uyghurs live are scarcely populated and less developed, so they contribute only a tiny fraction to the population and GDP in China. All other autonomous regions are inhabited mostly by Han Chinese who make more than half of the population there. Mongolia does not look like Mongolia when only 17% of inhabitants are Mongols.

A bit of sadness after seeing this.

What: Population, GDP in current USD, area in km2, ethnic composition and Human Development Index.
When: 2017
Where: Mainland China and its autonomous regions. Mainland China does not include Hong Kong, Macau and Taiwan.
Source: All data was found on Wikipedia. Let’s hope it’s correct.