Table: south_asian_canadian_immigration_2
Columns: year
indians_admitted
pakistanis_admitted
sri_lankans_admitted
bangladeshis_admitted
nepalis_admitted

Question: How many Sri Lankans were admitted in 2004 when more than 594 Nepalis were admitted?
SQL: SELECT SUM("sri_lankans_admitted") FROM south_asian_canadian_immigration_2 WHERE "year" = '2004' AND "nepalis_admitted" > 594