Year	Excellent quality or compliance with guide values	At least sufficient quality or compliance with mandatory values	Poor or non-complying	Closed	Quality classification not possible
1990	36.4	52.4	11.9		35.7
1991	19.9	35.2	10.8		54
1992	22	37.4	14.1		48.4
1993	31	53.3	12		34.7
1994	33.9	57.7	11.1		31.1
1995	34.9	48.1	10.4		41.5
1996	51.2	68.7	9.8		21.5
1997	59.8	79.7	11.6		8.7
1998	63.8	86.6	7.2		6.1
1999	63.7	88.3	5.1		6.5
2000	64.8	90.2	5		4.8
2001	66.9	91	4.4		4.5
2002	64.1	91.1	3.8		5.2
2003	68	92.4	2.7		5
2004	64.2	86.4	3.6		9.9
2005	63.1	85.7	3.7		10.7
2006	63.9	88.8	4.2		7.1
2007	62.6	88.7	4.4		6.9
2008	63.7	92	2.8		5.2
2009	62.2	89.4	3.1		7.4
2010	60.5	90.2	2.8		7
2011	70.4	90	2.4		7.6
2012	71.9	90.9	2.3		6.8
2013	76.5	89.7	2.4		8
2014	78.2	91.3	2.4		6.3