What is the lowest expenditures on R&D for Poland after 2011?
CREATE TABLE "list" (
  "rank" real,
  "country_region" text,
  "expenditures_on_r_d_billions_of_us_ppp" real,
  "pct_of_gdp_ppp" text,
  "year" real
);
SELECT MIN("expenditures_on_r_d_billions_of_us_ppp") FROM "list" WHERE "country_region"='poland' AND "year">2011;