How many South Asians on average were in Alberta in 2001 and in 2011 had 159,055?
CREATE TABLE "population" (
  "province" text,
  "south_asians_2001" real,
  "pct_2001" text,
  "south_asians_2011" real,
  "pct_2011" text
);
SELECT AVG("south_asians_2001") FROM "population" WHERE "province"='alberta' AND "south_asians_2011">'159,055';