Year % (cumulative) 1990 19.9112205505371 2000 18.8999996185303 2002 23.0400009155273 2004 23.8999996185303 2005 25.8786392211914 2006 25.7199993133545 2007 30.2054595947266 2008 25.0900001525879 2009 31.350269317627 2010 27.9799995422363 2012 29.5200004577637 2013 31.6299304962158 2014 31.1200008392334 2015 33.3462181091309 2016 32.1800003051758 2017 34.1090507507324 2018 34.0299987792969 2020 36.2700004577637 2022 37.9000015258789