Year Index (Units) 1992 1309.958 1993 63334.923 1994 627768.338 1995 2992861.513 1996 5394047.462 1997 6250944.870 1998 6912117.432 1999 8480039.412 2000 10871673.130 2001 12171795.749 2002 12263987.489 2003 12902927.666 2004 14068871.020 2005 15971002.719 2006 17420464.785 2007 19657766.633 2008 24611788.741 2009 28524973.495 2010 31196306.171 2011 33678925.086 2012 33869340.554 2013 33780943.689 2014 37868272.905 2015 56303884.053 2016 64137482.214 2017 73401082.835 2018 81436069.322 2019 87857948.112 2020 90264859.779 2021 98714214.842 2022 118637447.352 2023 133883456.599 2024 142513782.427 2025 153314020.427 2026 162786208.688 2027 171296199.304 2028 179861604.793 2029 188854534.034