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_203_94 ( id number, "year" number, "player" text, "country" text, "score" text, "to par" number, "margin\nof victory" text, "course" text, "location" text, "purse ($)" number, "winner's\nshare ($)" number )

### Question ###
how many strokes marked the margin of victory for justin rose in 2011 ?

### Accurate SQL ###

SELECT "margin\nof victory" FROM table_203_94 WHERE "year" = 2011