| ScienceDirect | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | July | Aug | Sept | Oct | Nov | Dec | |
| 2016 | 552 | 430 | 268 | 335 | 194 | 348 | 332 | 569 | 430 | |||
| 2015 | 117 | 65 | 162 | 60 | 125 | 241 | 1,053 | 335 | 642 | 653 | 405 | 206 |
| 2014 | 34 | 3 | 4 | 2 | 53 | 156 | 286 | 152 | 186 | 185 | 94 | 59 |
| 2013 | 6 | 8 | 21 | 2 | 0 | 5 | 9 | 20 | 265 | 4 | 5 | 5 |
| 2012 | 1 | 6 | 4 | 1 | 1 | 0 | 0 | 1 | 0 | 2 | 0 | |
| 2011 | 8 | 27 | 1 | 12 | 1 | 7 | 0 | 3 | 16 | 0 | 5 | 2 |
| 2010 | 2 | 25 | 0 | 5 | 3 | 29 | 13 | 13 | 44 | 8 | 6 | 13 |
| 2009 | 0 | 1 | 0 | 0 | 2 | 0 | 2 | 2 | 11 | 0 | 0 | 0 |