Statistics of the number of titles published in the UK in 2001
<a href="//commons.wikimedia.org/wiki/User:Olaf_Simons" title="User:Olaf Simons">Olaf Simons</a>
2009
As to the graphics: Own work by uploader, Data: J Whitaker &amp; Sons, published in <i>The Bookseller</i>. Source: <a rel="nofollow" class="external text" href="http://www.bookmarketing.co.uk/index.cfm/asset_id,885/index.html">http://www.bookmarketing.co.uk</a>