Information requested is available only at disproportionate cost, due to the work required to provide it.
The Exchequer effect of the announced changes to the national insurance system for the next three years can be found in the 2008 pre-Budget report in Table 1.2 Estimated costs for pre-Budget report policy decisions and others announced since Budget 2008 and the equivalent table in the 2009 pre-Budget report, are available at:
http://www.hm-treasury.gov.uk/d/pbr08_chapter1_379.pdf
and
http://www.hm-treasury.gov.uk/d/pbr09_chapter1.pdf
respectively.