year | created | modified
------+---------+----------
 2002 |      20 |        4
 2003 |     270 |       75
 2004 |     253 |      115
 2005 |     376 |      167
 2006 |     690 |      168
 2007 |    1226 |      201
 2008 |    1971 |      247
 2009 |    3035 |      410
 2010 |    4010 |      446
 2011 |    5500 |      638
 2012 |    8248 |      803
 2013 |   11703 |    23299
 2014 |   15062 |    16913
 2015 |    6857 |    15735