Year % (cumulative) 1991 19.6210899353027 1994 18.936840057373 1995 19.7295207977295 2003 32.4739608764648 2004 32.5316505432129 2006 30.3721923828125 2007 31.4685306549072 2008 34.1422882080078 2009 31.0771999359131 2010 30.6913509368896 2011 30.6870708465576 2012 32.2839317321777 2013 32.9676818847656 2014 33.294189453125 2015 34.5074501037598 2016 35.4178695678711 2017 33.9781837463379 2018 37.1166496276855 2019 35.4926795959473 2020 37.7416610717773 2021 36.8433036804199 2022 37.2319068908691