Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_66597 ( "Rank" real, "City" text, "Population" real, "Year of Census or Estimate" real, "Country" text )

### Question ###
In what Year of Census or Estimate is the Toronto Population larger than 1,556,396?

### Accurate SQL ###

SELECT SUM("Year of Census or Estimate") FROM table_66597 WHERE "Population" > '1,556,396' AND "City" = 'toronto'