Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 0.01 | |
| 1991 | 0.02 | |
| 1992 | 0.12 | |
| 1993 | 1.87 | |
| 1994 | 3.78 | |
| 1995 | 3.82 | |
| 1996 | 3.87 | |
| 1997 | 3.94 | |
| 1998 | 4.13 | |
| 1999 | 4.2 | |
| 2000 | 4.25 | |
| 2001 | 4.29 | |
| 2002 | 4.3 | |
| 2003 | 4.28 | |
| 2004 | 4.32 | |
| 2005 | 4.42 | |
| 2006 | 4.57 | |
| 2007 | 4.52 | |
| 2008 | 4.46 | |
| 2009 | 4.37 |
