Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 1.64 | |
| 1991 | 1.71 | |
| 1992 | 1.79 | |
| 1993 | 1.95 | |
| 1994 | 2.16 | |
| 1995 | 2.36 | |
| 1996 | 2.44 | |
| 1997 | 2.55 | |
| 1998 | 2.72 | |
| 1999 | 2.82 | |
| 2000 | 3.06 | |
| 2001 | 3.16 | |
| 2002 | 3.48 | |
| 2003 | 3.65 | |
| 2004 | 3.68 | |
| 2005 | 3.73 | |
| 2006 | 3.8 | |
| 2007 | 4.05 | |
| 2008 | 4.42 | |
| 2009 | 4.76 |
