Hi Naush, thanks for the notification. I'm guessing it's Exxaro resources you're researching? It looks like there's an Unknown value for 2015 under "Non-hazardous waste". If you're looking to change the value, click on the value and this will open up a new window where you can click the edit icon to change the value.
If you're looking to add a new value, please note that the system only allows one data point per year. Let me know if any other questions come up.
theresah.....2017-02-17 10:15:01 UTC