Year US Dollars adjusted for inflation) 1991 47651.188 1992 49880.031 1993 53852.059 1994 57786.887 1995 60116.383 1996 63376.355 1997 66226.031 1998 63977.777 1999 67157.492 2000 70220.641 2001 67297.461 2002 70111.414 2003 71016.258 2004 75246.758 2005 77573.367 2006 80237.648 2007 83688.922 2008 81539.672 2009 79056.453 2010 86982.695 2011 89786.406 2012 90388.672 2013 92888.594 2014 93316.688 2015 91277.992 2016 93965.188 2017 97737.156 2018 99411.578 2019 100815.117 2020 102727.078 2021 104746.125 2022 107093.336