Year Number 2004-01-01 9407082 2005-01-01 9308131 2006-01-01 10993738 2007-01-01 12636434 2008-01-01 13725641 2009-01-01 14596791 2010-01-01 14641562 2011-01-01 16993727 2012-01-01 16420685 2013-01-01 22253040 2014-01-01 9240264