title: Use ggplot2 to plot time series data
body: <p>I am doing a project which requires to use ggplot2 to plot time series data. This is the data set I am using:</p>
  
  <p><img src="https://i.stack.imgur.com/CKC68.jpg" alt="eur"></p>
  
  <p>This is what I've done now:</p>
  
  <pre><code>library(ggplot2)
  library(lubridate)
  eur$Date &lt;- as.Date(eur$Date)
  ggplot(eur, aes(Date, EUR)) + geom_line()
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/qJWvS.jpg" alt="plot"></p>
  
  <p>And I got this very weird plot. Can someone help me fix the problem?</p>