CREATE TABLE table_name_47 (inception VARCHAR2, assets_us$billion VARCHAR2, abbreviation VARCHAR2)

What's the inception for the country with 25.5 billion USD in assets and an abbreviation of psf?
SELECT inception FROM table_name_47 WHERE assets_us$billion = "25.5" AND abbreviation = "psf"
SELECT "inception" FROM "table_name_47" WHERE "25.5" = "assets_us$billion" AND "abbreviation" = "psf"