Year % (cumulative) 2000 23.7199993133545 2001 24.6700000762939 2002 25.3199996948242 2003 26.4599990844727 2004 25.9599990844727 2005 26.0200004577637 2006 27.6700000762939 2007 28.2299995422363 2008 26.4664993286133 2009 27.75 2010 27.4099998474121 2011 26.9060401916504 2012 30.0100002288818 2013 31.5 2014 32.3600006103516 2015 32.5 2016 33.0999984741211 2017 32.060001373291 2018 35 2019 37.4099998474121 2020 37.4099998474121 2021 36.8800010681152 2022 37.8899993896484