Year	Cadmium	Mercury	Lead
1990	100	100	100
1991	93.96	94.31	78.04
1992	89.38	87.66	64.37
1993	81.3	75.83	57.38
1994	79.22	72.74	52.04
1995	80.52	70.07	47.58
1996	76.48	66.12	41.51
1997	75.27	62.37	37.61
1998	69.09	58.88	34.24
1999	65.47	54.58	29.38
2000	62.81	51.89	20.4
2001	60.32	49.18	17.45
2002	57.23	47.61	14.17
2003	54.69	45.78	13.79
2004	53.62	45.05	13.3
2005	50.94	43.43	12.75
2006	48.91	42.92	12.64
2007	45.06	41.53	11.99
2008	43.89	39.71	11.86
2009	36.21	28.54	8.03
2010	38.01	28.82	8.8
2011	35.84	28.0	7.93
2012	34.7	26.92	7.87
2013	33.9	26.06	7.59
2014	34.08	25.54	7.7
2015	33.4	25.39	7.62