Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 2.78 | |
| 1991 | 3 | |
| 1992 | 3.6 | |
| 1993 | 4.3 | |
| 1994 | 5.64 | |
| 1995 | 10.06 | |
| 1996 | 13.44 | |
| 1997 | 14.34 | |
| 1998 | 18.32 | |
| 1999 | 25.96 | |
| 2000 | 32.54 | |
| 2001 | 38.83 | |
| 2002 | 43.86 | |
| 2003 | 46.99 | |
| 2004 | 50.99 | |
| 2005 | 56.92 | |
| 2006 | 62.85 | |
| 2007 | 65.97 | |
| 2008 | 69.06 | |
| 2009 | 75.14 |
