What is the lowest value for 1990, when the Region is East Asia (10 Economies), and when 1960 has a value less than 12.6?
CREATE TABLE "share_of_global_gdp_ppp_pct" (
  "region" text,
  "1950" real,
  "1960" real,
  "1970" real,
  "1980" real,
  "1990" real,
  "2000" real
);
SELECT MIN("1990") FROM "share_of_global_gdp_ppp_pct" WHERE "region"='east asia (10 economies)' AND "1960"<12.6;