Years | Relevant Studies | Selected Studies | Percentage |
2002 | 4 | 1 | 1.8 |
2003 | 5 | 2 | 3.5 |
2004 | 3 | 2 | 3.5 |
2005 | 11 | 3 | 8.9 |
2006 | 3 | 1 | 1.8 |
2007 | 7 | 4 | 7.1 |
2008 | 6 | 4 | 7.1 |
2009 | 22 | 4 | 7.1 |
2010 | 32 | 7 | 17.8 |
2011 | 14 | 4 | 7.1 |
2012 | 23 | 5 | 8.9 |
2013 | 18 | 6 | 10.7 |
2014 | 14 | 6 | 10.7 |
2015 | 12 | 7 | 17.8 |
Total | 162 | 56 |
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