Exercise

Add arrows to the lines in the plot

Instead of labeling years, use the arrow argument of the geom_path() call to show the direction of change. The arrows will point from 1996 to 2006, because that's how the data set is ordered. The arrow() function takes two arguments: The first is length, which can be specified with a unit() call, which you might remember from previous exercises. The second is type which defines how the arrow head will look.

Instructions

100 XP

Use the arrow argument and an arrow() function call to add arrows to each line.
For the arrows, specify a length of 1.5 "mm" (with a unit() call) and a type of "closed".