Purchasing power parities (PPP) conversion factor, local currency unit to international dollar
| Year | Value | Footnotes |
|---|---|---|
| 1991 | 4.71 | |
| 1992 | 14.9 | |
| 1993 | 26.78 | |
| 1994 | 31.99 | |
| 1995 | 33.54 | |
| 1996 | 36.73 | |
| 1997 | 47.81 | |
| 1998 | 56.79 | |
| 1999 | 55.79 | |
| 2000 | 54 | |
| 2001 | 54.15 | |
| 2002 | 57.44 | |
| 2003 | 56.44 | |
| 2004 | 56.22 | |
| 2005 | 55.66 | |
| 2006 | 54.32 | |
| 2007 | 54.94 | |
| 2008 | 54.38 | |
| 2009 | 54.54 |
