Year Excellent quality Sufficient quality or compliance with mandatory values (but not excellent quality or compliance with guide values) Poor quality or non-complying Closed Quality classification not possible
2010 74.64 17.2 1.62 0.68 5.86
2011 78.1 14.46 1.68 0.94 4.82
2012 79.05 15.12 1.84 0.18 3.81
2013 82.36 11.94 2.03 0.14 3.52