Create horizon plot
<p>I have the following example data and want to create a horizon plot, showing the changes in <code>area</code> column over the <code>year</code>. Any suggestion on doing this using <code>ggplot2</code>?</p>

<pre><code>year &lt;- 1990:2005
area1 &lt;- runif(16, 18,20)
area2 &lt;- runif (16,6,6.7)
area3 &lt;- runif(16, 7,8)
dat &lt;- data.frame(year, area1, area2, area3)
</code></pre>