On the date of 20 July 1999 what is the English abbr.?
CREATE TABLE "national_conservatives" (
  "group_name" text,
  "english_abbr" text,
  "french_abbr" text,
  "formal_european_parliament_name" text,
  "from" text
);
SELECT "english_abbr" FROM "national_conservatives" WHERE "from"='20 july 1999';