Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 1.93 | |
| 1991 | 2.18 | |
| 1992 | 2.48 | |
| 1993 | 2.73 | |
| 1994 | 2.88 | |
| 1995 | 3.06 | |
| 1996 | 3.25 | |
| 1999 | 2.7 | |
| 2000 | 2.77 | |
| 2001 | 2.44 | |
| 2002 | 3.21 | |
| 2003 | 3.35 | |
| 2004 | 3.43 | |
| 2005 | 3.43 | |
| 2006 | 3.52 | |
| 2007 | 3.7 | |
| 2008 | 3.94 | |
| 2009 | 4.24 |
