| Year | Excellent quality or compliant with guide values | Sufficient quality or compliant with mandatory values | Poor quality or non-compliant | Closed or Banned | Not enough samples |
|---|---|---|---|---|---|
| 1991 | 5332 | 1899 | 717 | 5 | 1641 |
| 1992 | 6126 | 1226 | 820 | 120 | 1302 |
| 1993 | 6638 | 1374 | 662 | 14 | 906 |
| 1994 | 6784 | 1470 | 579 | 11 | 750 |
| 1995 | 6565 | 1148 | 568 | 13 | 1300 |
| 1996 | 7437 | 1175 | 490 | 5 | 487 |
| 1997 | 7642 | 1329 | 431 | 18 | 174 |
| 1998 | 7779 | 1320 | 405 | 12 | 78 |
| 1999 | 7842 | 1282 | 342 | 7 | 121 |
| 2000 | 7895 | 1264 | 271 | 6 | 158 |
| 2001 | 7990 | 1199 | 274 | 22 | 109 |
| 2002 | 7992 | 1197 | 213 | 113 | 79 |
| 2003 | 8258 | 1035 | 127 | 155 | 19 |
| 2004 | 8179 | 1080 | 159 | 165 | 11 |
| 2005 | 8271 | 972 | 150 | 182 | 19 |
| 2006 | 8107 | 1082 | 193 | 180 | 32 |
| 2007 | 7939 | 1196 | 229 | 216 | 14 |
| 2008 | 8408 | 837 | 152 | 189 | 8 |
| 2009 | 8185 | 682 | 182 | 198 | 347 |
| 2010 | 7353 | 1553 | 106 | 25 | 557 |
| 2011 | 7676 | 1437 | 153 | 75 | 253 |
| 2012 | 7696 | 1502 | 168 | 6 | 222 |
| 2013 | 8142 | 1204 | 175 | 3 | 70 |
| 2014 | 8230 | 1129 | 161 | 8 | 66 |
| 2015 | 8317 | 1117 | 125 | 8 | 27 |