Year | Coauthorship Index |
2006 | 2.6 |
2007 | 2.8 |
2008 | 2.4 |
2009 | 2.0 |
2010 | 2.2 |
2011 | 2.7 |
2012 | 2.0 |
2013 | 2.8 |
2014 | 2.5 |
2015 | 2.0 |