We report sustainability-related information annually. The 2018 report complies with the GRI Standards guidelines of the Global Reporting Initiative (GRI) in accordance with the Core option. Reports Sustainability Report 2018 Sustainability Summary in Annual Report 2017 Sustainability Summary in Annual Report 2016 (pdf) Sustainability Report 2016 (pdf) Sustainability Report 2015 (pdf) Annual Report 2014 (pdf) Annual Report 2013 (pdf)