Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1990 | 2.03 | |
| 1991 | 2.07 | |
| 1992 | 2.09 | |
| 1993 | 2.1 | |
| 1994 | 2.07 | |
| 1995 | 2.05 | |
| 1996 | 2.01 | |
| 1997 | 1.97 | |
| 1998 | 1.96 | |
| 1999 | 1.99 | |
| 2000 | 1.99 | |
| 2001 | 1.96 | |
| 2002 | 1.9 | |
| 2003 | 1.91 | |
| 2004 | 1.88 | |
| 2005 | 1.85 | |
| 2006 | 1.82 | |
| 2007 | 1.76 | |
| 2008 | 1.7 | |
| 2009 | 1.69 |
