Year 1 in: rate varies by country 2000 21 2001 23 2002 22 2003 22 2004 23 2005 24 2006 25 2007 25 2008 26 2009 26 2010 29 2011 30 2012 31 2013 30 2014 35 2015 36 2016 38 2017 41 2018 40 2019 43 2020 47