Considering the timeframe you took your data from, there's no two ways about it, it's an obvious fact that investing in bitcoin yields greater returns than using same amount to invest in land. But that's not all there is to such comparison.

Apart from times when there's war or obvious disaster that makes a certain place inhabitable, land usually appreciate in value and never depreciate unlike bitcoin that can easily get bearish expecially in the short term.

As a typical Nigerian man, acquiring land goes beyond reselling it for just the returns that comes with it. It's also about owning it and being able to pass it down to the next generation which is why people still consider it long term potential and not just how much it has grown within a stipulated interval of time.