Adding the axes

In the chart, we've got three axes:

• On the left side, we show the relative change from the income in 2014.
• On the right side, we show the absolute income.
• In the middle, we have an axis showing the years.

Besides that, we also have a number of thin lines shown at two index point intervals. First off, let's see what needs to be done to add the axis that shows the years.