Sannadihii ugu dambeeyay, horumarinta warshadaha PVC-ga waxay gashay dheelitir la'aan yar oo u dhaxaysa sahayda iyo baahida. Wareegga warshadaha PVC-ga ee Shiinaha waxaa loo qaybin karaa saddex marxaladood. 1.2008-2013 Muddada kobaca xawaaraha sare ee awoodda wax soo saarka warshadaha. 2.2014-2016 muddada ka saarista awoodda wax soo saarka 2014-2016 muddada ka saarista awoodda wax soo saarka 3.2017 ilaa xilliga dheelitirka wax soo saarka ee hadda jira, dheelitir la'aanta u dhaxaysa sahayda iyo baahida.
