Year % (cumulative) 2002 17.8886108398438 2006 21.462963104248 2007 22.2587013244629 2008 23.3461093902588 2009 24.9953498840332 2010 26.6427993774414 2011 27.7338199615479 2012 28.5349807739258 2013 29.5544109344482 2014 30.846040725708 2015 31.6557235717773 2016 32.5140495300293 2017 33.7092437744141 2018 34.338493347168 2019 35.0451736450195 2020 36.2106781005859 2021 36.8755683898926 2022 37.2951812744141