Year Index (Units) 1992 2925.590 1993 300018.308 1994 1503447.326 1995 4234469.610 1996 5916546.985 1997 6515141.083 1998 7817698.859 1999 9319855.594 2000 11725868.833 2001 12443714.556 2002 12372958.838 2003 13392822.863 2004 15041301.192 2005 16597564.800 2006 18526993.006 2007 21600530.766 2008 26419749.866 2009 29671978.508 2010 32370877.332 2011 33847065.637 2012 33778526.729 2013 33946126.388 2014 42388383.407 2015 60748059.081 2016 68257399.300 2017 77587328.493 2018 85173122.123 2019 88625805.750 2020 93050297.988 2021 102369595.792 2022 129603229.209 2023 136192003.245 2024 147768320.830 2025 158113476.135 2026 166811213.905 2027 175153379.079 2028 183910761.387 2029 193106312.002