Year including construction (constant 2015 US$) 1991 5946.181507398921 1992 5415.8663544829415 1993 5051.499085181033 1994 4775.409115248612 1995 4587.3303587706905 1996 4659.43212108056 1997 4645.100702380537 1998 4694.179835584682 1999 4763.376206921242 2000 4890.660014887736 2001 4866.335332866356 2002 4902.068203081811 2003 4844.706957946202 2004 5063.143423362748 2005 5148.506912019736 2006 5269.265853310842 2007 5286.32465334557 2008 5451.726347381455 2009 5398.398536868938 2010 5495.913972451468 2011 5692.104705285707 2012 5684.524266511118 2013 5825.028308835537 2014 5750.69718157998 2015 5823.650764436856 2016 5932.456750984757 2017 6173.949305962681 2018 6409.759611942412 2019 6600.4828937883285 2020 6510.403933455061 2021 6556.180135008845 2022 6634.163387922719