Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_93 (year INTEGER, opponent VARCHAR)
### Question:
Name the sum of year for penrith panthers opponent
### Answer:
SELECT SUM(year) FROM table_name_93 WHERE opponent = "penrith panthers"