HOW DID POVERTY RATE GROW FROM 20% TO OVER 80% IN THE LAST 30 YEARS IN NIGERIA?

Wealth or riches and poverty are both man made in all ramifications. The economic system and the policy of a government can be designed to systematically make a handful of her citizens to either become super-rich and to push the majority of the same citizens into penury and abject poverty at the same time. How did the successive governments that have rule Nigeria to date helped directly in the national creation of the present poverty rate of over 80% that makes most Nigerians to live daily on $1 to $2 living budget? 
My perspectives on this issue of poverty in Nigeria is below:(i) The official policy of promoting stagnant wages for the Nigerian workers in both the public and the private sectors of our economy. The minimum wage of a typical Nigerian today is almost the same as the minimum wage that was paid in 1972 despite the yearly inflation rate, the rising cost of living and the rapid depreciation of the purchasing power as well as the official exchange rate value of the Nigerian Naira against the major international currencies of the world.
(ii). The highly porous tax law that allows rich Nigerians and wealthy corporations to evade taxes easily but forces the millions of the poor hardworking Nigerian workers on the monthly payroll system to pay their own taxes. (iii). The unabated decades of the massive looting of the state resources by the Nigerian state officials at the expense of the nation that has now created a new class of the super-rich Nigerians that is made up of retired and serving military or security personnels, senior civil servants, politicians and political office holders. (iv). The shady allocation of the nation's oil blocs, the import licenses and the selling of the failed state corporations at giveaway prices to the few selected Nigerians who are now dollar-rated billionaires in the name of the so called privatization and indigenization policy in Nigeria. 
(v). The refusal of the various governments that have ruled Nigeria to date to diversify our national economy from its present oil-dependent economy that benefits those oil corporations, few oil marketers and then leaves behind the tens of the millions of the university educated Nigerians without any hope for any employment. (vi). The adoption of the IMF policy in 1986 by the then military dictator, General Ibrahim Babangida that officially devalued the the powerful Nigerian Naira. This Structural Adjustment Policy (SAP) that was suggested to Babangida by IMF which he then adopted immediately reduced the purchasing power of most Nigerians by directly pushing more Nigerians below the national poverty level.