Year 1 in: rate varies by country 2000 23 2001 23 2002 24 2003 25 2004 26 2005 26 2006 27 2007 27 2008 28 2009 28 2010 29 2011 30 2012 31 2013 32 2014 33 2015 34 2016 35 2017 36 2018 37 2019 39 2020 41