What is the highest value for 2000, when the value for 1950 is 3.5, and when the value for 1970 is greater than 3.4?
CREATE TABLE "share_of_global_gdp_ppp_pct" (
  "region" text,
  "1950" real,
  "1960" real,
  "1970" real,
  "1980" real,
  "1990" real,
  "2000" real
);
SELECT MAX("2000") FROM "share_of_global_gdp_ppp_pct" WHERE "1950"=3.5 AND "1970">3.4;