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_name_97 (std_rank INTEGER, name VARCHAR, year VARCHAR)

### Question ###
How much Standard Rank has a Name of 311 south wacker drive, and a Year larger than 1990?

### Accurate SQL ###

SELECT SUM(std_rank) FROM table_name_97 WHERE name = "311 south wacker drive" AND year > 1990