Years	HCB	HCB index	HCH	HCH index	PCB	PCB index	Dioxins and furans	D&F index	PAH	PAH index
1990	5.2	100.0	185.1	100.0	13.79	100.0	0.01167	100.0	2671.1	100.0
1991	4.9	95.1	170.1	91.9	13.23	96.0	0.01113	95.4	2906.3	108.8
1992	5.1	98.1	132.0	71.3	12.73	92.3	0.01049	89.9	3082.7	115.4
1993	5.0	96.0	111.7	60.3	12.33	89.4	0.00974	83.4	3039.6	113.8
1994	4.6	88.8	103.5	55.9	11.87	86.1	0.00897	76.8	2758.6	103.3
1995	4.8	91.4	91.6	49.5	11.4	82.7	0.00836	71.6	2985.8	111.8
1996	4.8	91.8	91.4	49.4	10.73	77.9	0.00726	62.2	2609.7	97.7
1997	4.8	92.2	76.0	41.1	10.37	75.2	0.00635	54.4	2276.4	85.2
1998	5.0	97.1	59.9	32.4	10.0	72.5	0.00567	48.6	2160.6	80.9
1999	0.6	12.0	56.2	30.3	9.43	68.4	0.00476	40.8	2008.8	75.2
2000	0.6	11.4	49.6	26.8	5.04	36.6	0.00427	36.6	1541.2	57.7
2001	0.5	10.2	43.2	23.3	4.73	34.3	0.00366	31.3	1730.8	64.8
2002	0.5	9.0	28.4	15.4	4.08	29.6	0.00285	24.5	1197.6	44.8
2003	0.5	9.2	21.7	11.7	3.79	27.5	0.00247	21.2	1246.7	46.7
2004	0.4	8.0	19.1	10.3	3.98	28.9	0.00238	20.4	1182.4	44.3
2005	0.4	8.4	16.9	9.1	4.28	31.0	0.00216	18.5	1081.6	40.5
2006	0.3	6.4	15.1	8.2	4.26	30.9	0.00199	17.1	1094.9	41.0
2007	0.3	6.5	13.6	7.3	3.92	28.4	0.00195	16.7	1084.3	40.6
2008	0.3	6.0	12.2	6.6	4.15	30.1	0.00193	16.6	1128.9	42.3
2009	0.2	4.8	11.0	6.0	3.59	26.0	0.00172	14.7	1081.2	40.5
2010	0.2	4.3	10.0	5.4	3.97	28.8	0.00182	15.6	1203.2	45.0
2011	0.2	4.4	9.1	4.9	3.68	26.7	0.00181	15.5	1131.8	42.4