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