I posted this as a comment on that page, but it's worth showing here too. It's an interactive map of population on earth as a heatmap - basically both of those graphs mashed together, at very high resolution.
Both India and China have vast areas of relatively high-density rural population. If a part of the raw material for economic progress involves the shift of people from rural/farming to urban/professional lifestyles, then there's a huge potential here.
Looking at Europe, there seems to be much less data about Germany and the United Kingdom than France, Spain, Italy or Portugal. You can see this by the lack of contrast on the colours on the map.
I posted this as a comment on that page, but it's worth showing here too. It's an interactive map of population on earth as a heatmap - basically both of those graphs mashed together, at very high resolution.