Year current US$ 1989 19999.9995529652 1990 50000.0007450581 1991 70000.0002980232 1992 50000.0007450581 1993 70000.0002980232 1994 59999.9986588955 1995 59999.9986588955 1996 29999.999329447703 1997 19999.9995529652 1998 59999.9986588955 1999 79999.9982118607 2000 699999.988079071 2001 239999.994635582 2002 379999.99523162795 2003 680000.007152557 2004 1460000.03814697 2005 3259999.99046326 2006 449999.988079071 2007 699999.988079071 2008 879999.995231628 2009 1139999.98569489 2010 1279999.97138977 2011 1240000.0095367401 2012 1600000.02384186 2013 1509999.9904632599 2014 1710000.03814697 2015 8720000.26702881 2016 3130000.1144409203 2017 4000000 2018 4789999.96185303 2019 3420000.07629395 2020 3380000.1144409203 2021 3569999.9332428 2022 3750000