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_50 (year_opened VARCHAR, state VARCHAR, capacity VARCHAR)
### Question:
What was the year opened for North Carolina with a smaller than 21,500 capacity?
### Answer:
SELECT year_opened FROM table_name_50 WHERE state = "north carolina" AND capacity < 21 OFFSET 500