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_68 (population VARCHAR, member_countries VARCHAR)
### Question:
What is the Population of the nation that has a Member countries consisting of existing members (1973)?
### Answer:
SELECT population FROM table_name_68 WHERE member_countries = "existing members (1973)"