Looking for annual retail sales of slug repellents (Molluscicides) in
the US, UK and Germany after 1999. Active ingredient in most
repellents is Metaldehyde.  See
http://www.pan-uk.org/pestnews/homepest/slugs.htm for basic overview.
Have been able to locate data on trends in pesticide spending, which
includes "other" categories which encompass slug repellents, but I
have been unable to find specific info on molluscicides retail sales. 
Have also collect significant data on trends in consumer spending in
reference to household pesticides in general.  Am looking for a
specific numbers in reference to slug repellents.