Year % (cumulative) 1998 0.466441541910172 1999 0.741763234138489 2000 1.33677554130554 2001 1.56180024147034 2002 1.96221911907196 2003 1.80020344257355 2004 1.89072000980377 2005 2.28462862968445 2006 14.631950378418 2007 14.6766901016235 2008 15.0134296417236 2009 15.9964799880981 2010 16.9513607025146 2011 17.8985404968262 2012 18.3388595581055 2013 19.2276306152344 2014 19.7045497894287 2015 19.8389492034912 2016 20.765209197998 2017 21.1806507110596 2018 21.1450748443604 2019 20.9541893005371 2020 21.0694732666016 2021 22.2924365997314 2022 21.9364833831787