title: compare data with month from previous year in Qlikview
body: <p>I'm relatively new at Qlikview and wanted to compare some data from a selected year with its previous year.</p>
  
  <p>In Qlikview I have a table in which i show the count of all the contacts there have been with the customer per mount <code>[=count(contactsID)]</code> with the dimension <code>[contacts.month]</code>
  I want to show an other expression with the contacts with customers in the same month a year before.
  So if my table shows all the contacts from jan-2014 until dec-2014 I want a bar next to every month with the months jan-2013 until dec-2013
  for example jan-2013/jan-2014; feb-2013/feb-2014; etc</p>
  
  <p>some extra information:
  In the database is a date saved. In Qlikview i load that as:</p>
  
  <pre><code>load
  date as contact.date,
  Year(date) as contact.year,
  Month(date) as contact.month,
  Day(date) as contact.day;
  </code></pre>
  
  <p>If anybody could help i would be very grateful! Thanks to all of you in advance!</p>