Year Index (Units) 1996 39.700 1997 42.500 1998 47.100 1999 52.300 2000 54.640 2001 56.500 2002 59.560 2003 63.704 2004 68.471 2005 72.702 2006 79.084 2007 87.763 2008 92.632 2009 95.398 2010 106.122 2011 108.288 2012 106.801 2013 109.334 2014 111.468 2015 116.907 2016 119.049 2017 127.045 2018 128.969 2019 137.993 2020 141.311 2021 161.009 2022 176.864 2023 177.637 2024 184.743 2025 191.575 2026 197.322 2027 203.242 2028 209.339 2029 215.619