Year 1 in: rate varies by country 2000 280 2001 280 2002 280 2003 290 2004 290 2005 300 2006 310 2007 300 2008 310 2009 310 2010 310 2011 320 2012 320 2013 320 2014 320 2015 320 2016 340 2017 340 2018 340 2019 350 2020 360