| 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | Total | Ratio (%) |
| Construction plan & process management | 6 | 7 | 7 | 7 | 9 | 9 | 7 | 10 | 7 | 6 | 75 | 125 |
| Landscape materials | 12 | 12 | 14 | 12 | 10 | 16 | 13 | 9 | 15 | 9 | 122 | 20.3 |
| Landscape planting foundation | 2 | 1 | 0 | 3 | 1 | 3 | 2 | 4 | 2 | 2 | 20 | 3.3 |
| Work classification based construction | 11 | 17 | 19 | 19 | 16 | 9 | 13 | 12 | 18 | 17 | 151 | 25.2 |
| Landscape estimation | 12 | 9 | 10 | 7 | 9 | 6 | 10 | 14 | 9 | 13 | 99 | 16.5 |
| Basic structural mechanics | 10 | 9 | 8 | 6 | 8 | 10 | 7 | 6 | 4 | 7 | 75 | 125 |
| Survey | 7 | 5 | 2 | 6 | 7 | 7 | 8 | 5 | 5 | 6 | 58 | 9.7 |
| Total | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 600 | 100 |