Year 1 in: rate varies by country 2000 10 2001 11 2002 10 2003 11 2004 12 2005 13 2006 14 2007 14 2008 16 2009 17 2010 18 2011 18 2012 20 2013 20 2014 22 2015 23 2016 23 2017 27 2018 28 2019 29 2020 32