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	68.3	79.8	9.2		11.0
1991	58.7	80.9	7.7		11.4
1992	71.1	82.3	7.9		9.8
1993	74.8	86.1	6.4		7.6
1994	76.8	88.9	6.1		5.0
1995	74.2	84.6	5.1		10.3
1996	82.1	91.6	4.6		3.7
1997	82.7	93.3	5.3		1.4
1998	83.8	94.6	4.5		0.9
1999	85.3	95.1	3.6		1.4
2000	85.8	95.1	2.7		2.2
2001	86.3	95.4	2.7		2.0
2002	87.0	95.8	1.7		2.5
2003	89.3	96.8	1.2		2.0
2004	88.5	96.7	1.5		1.8
2005	89.1	96.1	1.3		2.6
2006	88.4	96.1	1.5		2.3
2007	86.1	95.2	2.2		2.6
2008	85.0	96.3	1.4		2.3
2009	86.7	95.9	1.5		2.6
2010	80.6	92.5	1.1		6.4
2011	81.3	93.7	1.4		5.0
2012	82.0	95.5	1.6		2.8
2013	85.2	96.8	1.9		1.4
2014	85.5	96.8	1.7		1.5