Year Total volume of waste water Delivered directly to a public waste water treatment plant
collected, total collected, not treated discharged to a public waste water treatment plant
sewage
1990 877,187 97,814 779,373 ..
1991 826,978 87,546 739,433 ..
1992 787,879 74,602 713,278 ..
1993 709,786 64,948 644,838 ..
1994 652,960 59,182 593,778 ..
1995 639,697 56,253 583,444 ..
1996 608,372 87,388 520,984 ..
1997 570,615 81,832 488,782 ..
1998 549,843 62,074 487,769 ..
1999 588,460 65,191 523,269 ..
2000 530,484 51,291 479,192 ..
2001 519,549 39,336 480,214 ..
2002 525,179 33,511 491,667 ..
2003 525,082
38,582a
486,501 1,788
2004 557,456
23,196a
534,260 1,575
2005 588,064
29,819a
558,245 2,133
2006 567,303 34,365 532,938 3,021
2007 533,889 25,807 508,082 2,901
2008 542,106 25,311 516,796 2,992
2009 529,022 23,953 505,069 2,457
2010 556,338
5,131a
551,207 2,167
2011 467,594
3,424a
464,170 1,793
2012 435,692 6,336 429,355 2,292
2013 496,331 14,780 481,551 1,888
2014 493,359 19,607 473,753 1,732
2015 494,857 12,405 482,452 1,531
2016 561,796 17,243 544,552 1,524
2017 552,482 14,782 537,700 1,561
2018 570,794 10,918 559,876 1,540
2019 553,562 15,004 538,558 1,513

Footnotes

a
Partly estimated data.
.