| Time | Awards | |
| 2020 | ISO-45001:2018, 2020 SGS Certified |  |
| 2017 | ISO-14001:2015, 2017 SGS Certified |  |
| 2013 | OHSAS-18001:2007, 2013 DNV Certified | |
| 2010 | OHSAS-18001:2007, 2010 DNV Certified | |
| 2005 | ISO-14001:2004, 2005 DNV Certified | |
| 2004 | OHSAS-18001:1999, 2004 DNV Certified | |
| 1996 | ISO-14001:1996, 1999 DNV Certified | |
