Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 2.27 | |
| 1991 | 2.51 | |
| 1992 | 2.77 | |
| 1993 | 2.95 | |
| 1994 | 3.13 | |
| 1995 | 3.31 | |
| 1996 | 3.46 | |
| 1997 | 3.67 | |
| 1998 | 3.86 | |
| 1999 | 3.97 | |
| 2000 | 4.05 | |
| 2001 | 4.16 | |
| 2002 | 4.47 | |
| 2003 | 4.63 | |
| 2004 | 4.57 | |
| 2005 | 4.57 | |
| 2006 | 4.63 | |
| 2007 | 4.83 | |
| 2008 | 5.18 | |
| 2009 | 5.57 |
