Year	Gross value added	Ammonia	NMVOC	Nitrogen oxides	PM10	PM2.5	Sulphur oxides	Total greenhouse gases (CO2-equivalent)
1990		100.0	100.0	100.0			100.0	100.0
1991		88.72	95.55	96.93			92.79	96.75
1992		83.29	94.42	91.61			85.98	92.51
1993		77.2	92.76	85.54			80.88	89.75
1994		79.74	90.99	80.57			75.93	90.55
1995		85.86	91.5	87.94			79.04	91.83
1996		86.96	89.39	85.34			73.85	92.82
1997		85.15	88.55	81.42			70.62	91.5
1998		86.8	84.55	78.36			64.6	90.22
1999		82.06	79.99	74.13			56.72	87.03
2000	100.0	73.93	79.45	74.52	100.0	100.0	53.34	89.17
2001	101.09	72.69	77.37	73.61	91.21	97.87	50.46	88.82
2002	102.08	76.3	75.77	73.53	95.18	93.21	47.73	88.81
2003	101.31	74.88	71.27	74.45	92.89	91.42	45.3	91.35
2004	105.81	80.25	69.13	73.26	90.36	88.39	42.58	91.3
2005	110.91	84.39	67.7	74.14	88.55	85.64	42.06	91.02
2006	118.12	80.28	66.28	72.86	87.6	81.4	41.65	91.55
2007	124.27	79.91	65.35	72.56	87.3	78.07	41.91	92.69
2008	124.89	79.5	60.96	65.06	83.04	70.34	34.12	87.95
2009	108.87	65.19	57.38	58.05	73.96	59.57	30.27	78.71
2010	120.1	78.95	57.2	57.84	82.41	62.71	28.54	81.98
2011	125.96	76.73	55.56	57.08	80.81	62.76	28.95	81.1
2012	127.95	87.15	55.66	56.08	81.58	59.61	26.95	79.99