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| Year | Numbers of articles | Percentage of 19609 articles |
| 2018 | 2297 | 11.71% |
| 2017 | 2383 | 12.15% |
| 2016 | 2306 | 11.76% |
| 2015 | 2081 | 10.61% |
| 2014 | 2053 | 10.47% |
| 2013 | 1933 | 9.86% |
| 2012 | 1791 | 9.13% |
| 2011 | 1774 | 9.05% |
| 2010 | 1531 | 7.81% |
| 2009 | 1460 | 7.45% |
