Year % (cumulative) 1998 0.466441541910172 1999 0.741763234138489 2000 0.949455678462982 2001 1.01185286045074 2002 0.908628284931183 2003 0.683051645755768 2004 0.870497047901154 2005 1.01918065547943 2006 1.06745505332947 2007 1.34640026092529 2008 1.69678938388824 2009 1.83408200740814 2010 2.5318648815155 2011 2.92012238502502 2012 3.47139024734497 2013 3.62477159500122 2014 19.5668392181396 2015 19.6470508575439 2016 20.5878200531006 2017 21.083869934082 2018 21.0393199920654 2019 20.8730201721191 2020 20.9772453308105 2021 22.1672801971436 2022 20.9231128692627