Where did comparisons with single-pilot twins come into the equation?
As for data supporting generic types, try the following - as posted earlier .....
If you want some general statistics for helicopter operations wordlwide, you can find stats for 2000-2003 on the publications page of the OGP website -
http://www.ogp.org.uk/Publications/index.asp It may be a UK website, but the data is global!!
Enter the word helicopter in the search box and enter - you can download the .pdf reports free of charge
The breakdown of info is by helicopter general type rather than manufacturer type, but may make useful reading for some.