Year 1 in: rate varies by country 2000 36 2001 34 2002 33 2003 32 2004 34 2005 33 2006 31 2007 32 2008 32 2009 30 2010 33 2011 33 2012 33 2013 34 2014 38 2015 39 2016 39 2017 40 2018 39 2019 46 2020 46