Table schema:
CREATE TABLE table_name_86 (south_asians_2001 INTEGER, province VARCHAR, south_asians_2011 VARCHAR)

Question: How many South Asians on average were in Alberta in 2001 and in 2011 had 159,055?
SQL: SELECT AVG(south_asians_2001) FROM table_name_86 WHERE province = "alberta" AND south_asians_2011 > 159 OFFSET 055