Year HCB PCB Dioxins and furans PAH
1990 100.0 100.0 100.0 100.0
1991 95.33 96.2 94.99 96.0
1992 97.74 92.4 89.52 103.0
1993 92.71 89.5 83.44 101.8
1994 85.45 85.9 77.01 92.3
1995 88.75 72.4 70.42 103.2
1996 88.17 67.2 62.1 87.5
1997 88.64 64.1 55.38 75.9
1998 93.1 60.4 49.28 71.9
1999 14.15 56.4 41.91 66.5
2000 11.81 37.4 37.52 58.9
2001 10.41 35.1 31.07 57.6
2002 8.43 30.5 24.51 39.1
2003 8.55 28.5 20.97 40.1
2004 7.41 28.0 20.47 38.4
2005 7.39 29.5 18.54 39.4
2006 5.42 30.4 18.53 40.5
2007 5.49 30.2 18.02 39.8
2008 5.04 30.7 18.21 39.1
2009 4.12 26.9 16.15 37.4
2010 3.73 24.5 16.65 40.2
2011 4.14 27.0 16.08 39.2
2012 3.72 23.0 14.8 36.7
2013 3.55 24.3 15.44 38.0