Year US Dollars adjusted for inflation) 1964 7000000 1965 1000000 1992 15000000 1993 10000000 1994 18000000 1996 19000000 1997 31000000 1998 9000000 1999 3000000 2000 2000000 2001 2000000 2003 6000000 2004 22000000 2005 13000000 2006 23000000 2017 30000000 2022 7000000