| Año | Valor |
|---|---|
| 1997-01-01 | 20129999.160767 |
| 1998-01-01 | 13199999.809265 |
| 1999-01-01 | 13229999.542236 |
| 2000-01-01 | 18799999.237061 |
| 2001-01-01 | 20219999.313355 |
| 2002-01-01 | 16430000.305176 |
| 2003-01-01 | 23450000.762940 |
| 2004-01-01 | 28959999.084473 |
| 2005-01-01 | 20760000.228882 |
| 2006-01-01 | 17909999.847412 |
| 2007-01-01 | 25959999.084473 |
| 2008-01-01 | 27559999.465942 |
| 2009-01-01 | 29629999.160767 |
| 2010-01-01 | 27729999.542236 |
| 2011-01-01 | 35139999.389648 |
| 2012-01-01 | 32529998.779297 |
| 2013-01-01 | 38130001.068115 |
| 2014-01-01 | 29440000.534058 |
| 2015-01-01 | 22840000.152588 |
| 2016-01-01 | 21989999.771118 |
Fuente: World Bank