Year 1 in: rate varies by country 2000 23 2001 24 2002 24 2003 24 2004 24 2005 25 2006 25 2007 25 2008 25 2009 26 2010 26 2011 26 2012 26 2013 26 2014 27 2015 27 2016 27 2017 27 2018 30 2019 30 2020 29