What is the gdp per capita in 2008 for the region with a combined gross enrollment ratio of 86.6 in 2009?
create table table_25042332_33 (gdp__ppp__per_capita__2008_ integer, combined_gross_enrollment_ratio__2009_ varchar, PRIMARY KEY (gdp__ppp__per_capita__2008_))
select max(gdp__ppp__per_capita__2008_) from table_25042332_33 where combined_gross_enrollment_ratio__2009_ = "86.6"