| Year | Cd, Hg, Ni, Pb | TOC | Total N | Total P | GVA |
|---|---|---|---|---|---|
| 2010 | 100 | 100 | 100 | 100 | 100 |
| 2011 | 94 | 100 | 91 | 86 | 102 |
| 2012 | 94 | 95 | 88 | 90 | 101 |
| 2013 | 94 | 92 | 91 | 89 | 101 |
| 2014 | 102 | 90 | 89 | 86 | 103 |
| 2015 | 68 | 89 | 90 | 89 | 105 |
| 2016 | 53 | 89 | 88 | 83 | 107 |
| 2017 | 49 | 77 | 80 | 85 | 110 |
| 2018 | 58 | 64 | 73 | 70 | 113 |
| 2019 | 59 | 77 | 85 | 73 | 114 |