Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 2.3 | |
| 1991 | 2.63 | |
| 1992 | 2.86 | |
| 1993 | 3.08 | |
| 1994 | 3.37 | |
| 1995 | 3.61 | |
| 1996 | 3.83 | |
| 1997 | 3.96 | |
| 1998 | 4.17 | |
| 1999 | 4.34 | |
| 2000 | 4.03 | |
| 2001 | 4 | |
| 2002 | 4.07 | |
| 2003 | 4.11 | |
| 2004 | 4.02 | |
| 2005 | 4.07 | |
| 2006 | 4.18 | |
| 2007 | 4.15 | |
| 2008 | 4.32 | |
| 2009 | 4.42 |
