Year	Cadmium	Lead	Mercury
1990	100	100	100
1991	93.77	78.92	95
1992	89.97	64.02	89.06
1993	85.58	58.16	77.47
1994	81.34	52.52	75.06
1995	60.05	47.21	65.8
1996	56.85	41.01	61.25
1997	55.87	37.27	56.86
1998	51.39	33.95	54.17
1999	48.66	28.85	51.18
2000	47.89	20.06	50.29
2001	45.42	17	47.16
2002	43.33	13.82	45.59
2003	41.1	13.26	43.49
2004	40.25	12.77	42.98
2005	38.39	12.28	42.16
2006	36.94	12.09	41.72
2007	33.99	11.99	40.47
2008	33.28	11.44	38.99
2009	27.39	7.74	28.35
2010	27.85	8.37	28.19
2011	26.37	8.1	27.6
2012	25.24	8.1	26.58
2013	25.04	7.84	25.87