Year 1 in: rate varies by country 2000 22 2001 23 2002 22 2003 21 2004 24 2005 25 2006 25 2007 25 2008 28 2009 28 2010 30 2011 29 2012 29 2013 32 2014 26 2015 32 2016 34 2017 33 2018 32 2019 35 2020 35