year number of flood phenomena in severity class 'very high'
1980 12
1981 22
1982 10
1983 13
1984 6
1985 9
1986 4
1987 20
1988 17
1989 12
1990 23
1991 20
1992 25
1993 26
1994 42
1995 35
1996 19
1997 31
1998 44
1999 33
2000 38
2001 34
2002 77
2003 28
2004 23
2005 54
2006 42
2007 47
2008 29
2009 23
2010 71