"Jahr" "Pflanzenschutzmittel im Grundwasser" 1993 0.754 1994 0.142 1995 0.092 1996 0.172 1997 0.171 1998 0.382 1999 0.278 2000 0 2001 0.197 2002 0.263 2003 0.39 2004 0.603 2005 0.727 2006 0.773 2007 0.614 2008 0.62 2009 0.983 2010 1.519 2011 0.943 2012 0.945 2013 0.88 2014 0.626 2015 0.532 2016 0.439 2017 0.611 2018 0.658 2019 0.726 2020 0.47 2021 0.22 2022 0.38