How many items are listed under gdp per capita under the nation of Burkina Faso?
CREATE TABLE "list_of_african_countries_by_gdp_per_cap" (
  "african_rank" real,
  "world_rank" real,
  "nation" text,
  "gdp_per_capita" text,
  "total_gdp_world_rank" real
);
SELECT COUNT("gdp_per_capita") FROM "list_of_african_countries_by_gdp_per_cap" WHERE "nation"='Burkina Faso';