The amount of eel fishing in Europe fell by 95% from 1980 to 2010. How many eels learn there will be left in 2030, if the percentage decrease per year is unchanged over time.

r^30 = 0.05

r^50 = (r^30)^(5/3) = 0.05^(5/3) = 0.0068 or a drop of 99.32%