Year including construction (constant 2015 US$) 1991 2410.575600573751 1992 2604.2003959694525 1993 2649.787483105411 1994 2812.0661498615677 1995 3041.074988316016 1996 3124.51226361871 1997 2954.761972454823 1998 2870.6301300333266 1999 2921.4445430764013 2000 3196.2166101370544 2001 3216.258294524076 2002 3321.0065798651485 2003 3436.6699894180088 2004 3356.151811570616 2005 3311.4901564507823 2006 3408.99143658193 2007 3347.109186745134 2008 3496.590900476434 2009 3307.281000087949 2010 3520.6254948233695 2011 3585.773084079982 2012 3684.5578265932377 2013 3282.876507706805 2014 3082.485744237375 2015 3144.007450623826 2016 3126.840904103038 2017 3014.001721333279 2018 3082.6647386563222 2019 2814.648531281517 2020 2511.9905261748245 2021 2554.359083634789 2022 2413.708828516371