Year	Arsenic and compounds (As)	Cadmium and compounds (Cd)	Chromium and compounds (Cr)	Copper and compounds (Cu)	Lead and compounds (Pb)	Mercury and compounds (Hg)	Nickel and compounds (Ni)	Zinc and compounds (Zn)
2007	3.5	0.5	3.4	19.7	4.0	0.0	4.5	99.6
2008	1.9	0.2	3.3	27.7	2.9	0.0	3.4	95.7
2009	1.7	0.3	4.0	29.5	4.2	0.1	5.2	175.2
2010	1.3	0.2	2.6	91.6	2.6	0.0	3.2	127.1
2011	1.3	0.1	2.5	32.6	1.9	0.0	3.0	108.7
2012	0.9	0.2	1.0	18.2	1.2	0.0	7.3	56.5
2013	1.1	0.1	1.1	40.3	1.3	0.0	3.8	68.2
2014	0.9	0.1	0.8	37.9	0.8	0.0	3.4	64.4
2015	0.7	0.1	0.7	7.8	0.9	0.0	3.6	54.8
2016	0.5	0.1	0.7	23.1	0.6	0.0	2.1	42.7
2017	2.6	1.2	3.4	32.0	6.2	0.2	4.3	167.6
2018	3.4	0.9	1.3	16.4	9.6	0.1	2.9	161.4
2019	31.4	3.1	1.1	14.6	13.4	0.1	2.8	105.6
2020	2.1	3.6	1.0	21.7	20.0	0.3	2.7	149.3