Year Index 1996 38.4 1997 41.15 1998 42.617 1999 50.775 2000 52.8 2001 55.292 2002 58.392 2003 61.173 2004 64.633 2005 69.963 2006 76.372 2007 83.433 2008 91.776 2009 93.361 2010 100 2011 108.543 2012 107.519 2013 106.969 2014 110.251 2015 114.665 2016 117.113 2017 124.181 2018 127.429 2019 130.631 2020 134.56 2021 138.576 2022 142.776 2023 147.059 2024 151.471