Nistkastenbelegung: Jahresvergleich

2017
 
90%
2016
 
78%
2015
 
86%
2014
 
87%
2013
 
84%
2012
 
87%
2011
 
81%
2010
 
91%
2009
 
73%
2008
 
78%
2007
 
80%
2006
 
72%
2005
 
87%
2004
 
83%
2003
 
69%
2002
 
84%
2001
 
68%
2000
 
76%
1995
 
94%