Maybe they spent $101 billion up to 2015, i.e. it is the total sum of money spent for the last two decades. $5 billion a year for the last 20 years sounds too h

Maybe they spent $101 billion up to 2015, i.e. it is the total sum of money spent for the last two decades. $5 billion a year for the last 20 years sounds too high still though (but feasible)