Year	Cadmium	Chromium	Mercury	Nickel	Lead	Zinc
1990	100.0	100.0	100.0	100.0	100.0	100.0
1991	105.5	98.4	107.1	104.9	72.4	99.2
1992	100.4	95.7	112.1	99.8	104.7	100.7
1993	108.3	104.2	11.9	107.2	54.6	98.3
1994	106.1	108.8	11.3	106.1	55.9	98.8
1995	103.4	104.3	11.4	103.8	46.7	94.6
1996	97.9	98.3	10.9	104.1	34.5	92.3
1997	93.0	103.4	10.4	92.8	29.7	79.7
1998	82.3	103.8	9.3	84.5	24.6	71.2
1999	73.2	91.5	8.1	75.6	22.3	64.4
2000	72.6	87.0	8.8	70.8	21.2	59.1
2001	69.7	88.8	9.4	72.2	26.0	60.9
2002	69.6	85.3	8.6	71.6	16.1	60.0
2003	29.5	79.6	5.9	33.6	9.1	22.8
2004	22.1	75.5	3.5	26.4	7.4	16.2
2005	24.6	91.1	3.5	29.8	8.8	17.6
2006	35.3	118.6	4.3	42.1	12.1	26.2
2007	24.1	96.3	2.9	29.8	9.3	16.8
2008	48.5	105.9	4.9	53.9	12.9	38.7
2009	22.4	88.0	2.9	27.5	8.1	15.6
2010	21.0	74.3	2.8	25.4	7.1	15.2
2011	20.3	64.8	2.8	23.7	5.9	15.1
2012	16.4	80.6	2.1	21.2	5.6	10.5
2013	20.4	92.5	2.4	25.9	6.9	13.7
2014	23.8	72.4	2.7	27.6	6.7	18.0
2015	18.3	79.2	2.2	22.8	5.9	12.3
2016	17.8	77.4	2.0	22.3	5.8	12.0
2017	20.7	72.3	2.4	24.6	6.1	15.0
2018	18.0	85.8	2.1	23.0	5.9	11.6
2019	16.6	83.5	2.4	21.6	5.9	10.6
2020	25.4	77.0	3.0	29.4	7.1	19.1