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| Year | 5 | 4 | 3 | 2 | 1 | Mean | Total # Students |
|---|---|---|---|---|---|---|---|
| 2018 | 21.1% | 26.3% | 18.3% | 14.5% | 19.8% | - | - |
| 2017 | 18.8% | 25.2% | 20.1% | 14.7% | 21.2% | - | - |
| 2016 | 19.0% | 26.1% | 19.1% | 14.2% | 21.6% | - | - |
| 2015 | 20.1% | 26.2% | 19.9% | 13.1% | 20.7% | - | - |
| 2014 | 18.5% | 27.1% | 19.9% | 13.6% | 20.9% | - | - |
| 2013 | 21.2% | 26.7% | 19.6% | 13.0% | 19.5% | - | - |
| 2012 | 20.5% | 26.1% | 19.5% | 13.6% | 20.3% | - | - |
| 2011 | 20.2% | 26.3% | 19.8% | 12.9% | 20.8% | - | - |