Table schema:
CREATE TABLE table_25042332_33 (gdp__ppp__per_capita__2008_ INTEGER, combined_gross_enrollment_ratio__2009_ VARCHAR)

Question: What is the gdp per capita in 2008 for the region with a combined gross enrollment ratio of 86.6 in 2009?
SQL: SELECT MAX(gdp__ppp__per_capita__2008_) FROM table_25042332_33 WHERE combined_gross_enrollment_ratio__2009_ = "86.6"