Impact Factor
| Year | Impact Factor | Number of articles published |
| 2016 | 0.793 | 298 |
| 2015 | 0.790 | 318 |
| 2014 | 0.871 | 282 |
| 2013 | 0.600 | 213 |
| 2012 | 0.462 | 230 |
| 2011 | 0.508 | 195 |
| 2010 | 0.543 | 171 |
| 2009 | 0.947 | 148 |
| 2008 | 0.963 | 117 |
| 2007 | 0.627 | 108 |
| 2006 | 0.353 | 106 |
| 2005 | 0.352 | 106 |
| 2004 | 0.366 | 95 |
| 2003 | 0.461 | 98 |
| 2002 | 0.639 | 96 |
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