Year National Currency 2004-01-01 4402000000 2005-01-01 6970000000 2006-01-01 9100000000 2007-01-01 13882000000 2008-01-01 18242000000 2009-01-01 19350000000 2010-01-01 19239000000 2011-01-01 19165000000 2012-01-01 18977000000 2013-01-01 18940000000 2014-01-01 18642000000 2015-01-01 18387000000 2016-01-01 18750000000 2017-01-01 19867000000