Year 1 in: rate varies by country 2000 27 2001 28 2002 29 2003 30 2004 31 2005 32 2006 32 2007 32 2008 32 2009 32 2010 33 2011 34 2012 34 2013 34 2014 34 2015 36 2016 36 2017 36 2018 37 2019 37 2020 40