Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 1.28 | |
| 1991 | 1.37 | |
| 1992 | 1.55 | |
| 1993 | 1.72 | |
| 1994 | 1.85 | |
| 1995 | 1.99 | |
| 1996 | 2.13 | |
| 1997 | 2.26 | |
| 1998 | 2.37 | |
| 1999 | 2.5 | |
| 2000 | 2.63 | |
| 2001 | 2.72 | |
| 2002 | 2.9 | |
| 2003 | 3.09 | |
| 2004 | 3.22 | |
| 2005 | 3.38 | |
| 2006 | 3.66 | |
| 2007 | 3.81 | |
| 2008 | 4.13 | |
| 2009 | 4.48 |
