Economic development is a complicated factor to measure. In Uganda, where most people work off the grid and data is hard to come by, this is definitely the case. So, proxy indicators are used.
One proxy indicator which is becoming a lot more popular these days is night lights. How accurate you ask? Read this. So we looked at Kampala and Uganda and measured the difference over time. The increase in access to electricity is quite clear.
A picture tells a thousand words so...