Needs to be logarithmic because it looks like it stabilises in recent years as it approaches 0
Discussion
You can approach 0 in an infinite number of ways, logarithmically is just one way. You could also see an exponential drop to 0. What you mean to say is that it asymptoically approaches 0 as time continues infinitly. The way it gets there is anyone's guess.
I mean the Y axis should be shown as a logarithmically.