Student looking for employment statistics for Nigeria

Hey all;

I'm a student in University doing a project on the oil sabotages/thefts/spills in Nigeria and we are looking at solutions to help the situation.  We have a few questions?  Does anyone know what the unemployment rate is in Nigeria?  Also, what would be considered a low salary in Nigeria?  Also, what would you guys consider to be a good wage in order to live an average lifestyle?  Lastly, does anyone know why so much oil is getting stolen?  What are the issues around the theft.

Thanks