I am not sure if I will be able to describe my situation correctly but I will try.
So I am making report based on reports from 2006-2018. In each year I have columns with data like this:
<tbody>
2007
Recycle
2007
Reuse; Recycle
2007
Reuse; Reduce
2008
Reduce; Recycle
2007
Recycle
2007...