Year Index 1995 18.322 1996 23.689 1997 26.217 1998 28.278 1999 30.149 2000 32.241 2001 38.324 2002 43.262 2003 49.333 2004 56.733 2005 66.864 2006 72.358 2007 76.267 2008 85.099 2009 95.768 2010 108.928 2011 120.719 2012 135.478 2013 146.986 2014 158.815 2015 173.125 2016 200.298 2017 233.352 2018 261.574 2019 292.18 2020 326.454 2021 363.381 2022 404.786 2023 449.887 2024 499.375