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| Citations | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Negative | 1 | 1 | 1 | 1 | 1 | 5 | |||||||||||||
| Neutral | 2 | 1 | 1 | 2 | 1 | 3 | 2 | 4 | 2 | 2 | 1 | 2 | 23 | ||||||
| Affirmative | 1 | 3 | 3 | 3 | 6 | 7 | 9 | 9 | 6 | 10 | 8 | 11 | 8 | 12 | 16 | 25 | 16 | 15 | 168 |
| Citing as affirmative | 1 | 3 | 3 | 3 | 6 | 6 | 7 | 8 | 6 | 9 | 8 | 9 | 8 | 11 | 12 | 24 | 16 | 15 | 155 |
