years

2005

2006

2007

2008

2009

2010

2011

Gas emission quantity (m3/t)

10.60

9.80

11.30

10.40

12.50

11.70

13.20

years

2012

2013

2014

2015

2016

2017

Gas emission quantity (m3/t)

11.30

13.80

14.20

12.90

14.50

14.90