Year current international $ 1990 1940 1991 1840 1992 1780 1993 1640 1994 1650 1995 1680 1996 1740 1997 1800 1998 1870 1999 1940 2000 1970 2001 2030 2002 2110 2003 2260 2004 2450 2005 2500 2006 2640 2007 2730 2008 2800 2009 2840 2010 2860 2011 2930 2012 2980 2013 3150 2014 3320 2015 3410 2016 3530 2017 3660 2018 3890 2019 4110 2020 4230 2021 4660 2022 4990 2023 5270