https://www.pordata.pt/Site/MicroPage.aspx?DatabaseName=Europa&MicroName=Despesa+com+a+protec%C3%A7%C3%A3o+ambiental+nas+Ind%C3%BAstrias+Extractivas+total+e+por+alguns+dom%C3%ADnios+de+ambiente+(Euro+ECU)&MicroURL=1399