Year	Cadmium (t)	Cadmium index	Lead (t)	Lead index	Mercury (t)	Mercury index
1990	256.15	100.0	242.92	100.0	23894.83	100.0
1991	239.65	93.56	224.16	92.28	18881.58	79.02
1992	229.77	89.7	210.65	86.72	15323.32	64.13
1993	218.39	85.26	183.39	75.49	13963.77	58.44
1994	207.49	81.0	177.84	73.21	12615.42	52.8
1995	183.56	71.66	156.17	64.29	11327.73	47.41
1996	175.36	68.46	145.28	59.81	9864.12	41.28
1997	168.28	65.7	134.93	55.55	8962.96	37.51
1998	150.91	58.91	128.79	53.02	8012.24	33.53
1999	143.43	56.0	121.85	50.16	6938.52	29.04
2000	137.29	53.6	120.24	49.5	4797.16	20.08
2001	131.97	51.52	113.11	46.56	4085.69	17.1
2002	125.55	49.02	109.24	44.97	3285.72	13.75
2003	119.6	46.69	104.59	43.06	3156.08	13.21
2004	117.76	45.97	103.48	42.6	3045.3	12.74
2005	116.3	45.4	102.47	42.18	2952.52	12.36
2006	115.15	44.95	101.17	41.65	2964.76	12.41
2007	103.86	40.55	101.0	41.58	2954.09	12.36
2008	103.77	40.51	95.79	39.43	2914.2	12.2
2009	90.63	35.38	82.23	33.85	2444.85	10.23
2010	97.67	38.13	82.43	33.93	2663.77	11.15
2011	89.43	34.91	80.8	33.26	2579.79	10.8
2012	88.09	34.39	78.52	32.32	2560.79	10.72