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_87 (year_of_intro VARCHAR, name__designation VARCHAR, primary_cartridge VARCHAR, country_of_origin VARCHAR, type VARCHAR)
### Question:
What is the total number of Year of Intro(s), when Country of Origin is Soviet Union, when Type is Reusable, when Primary Cartridge is 40mm, and when Name/ Designation is RPG-29?
### Answer:
SELECT COUNT(year_of_intro) FROM table_name_87 WHERE country_of_origin = "soviet union" AND type = "reusable" AND primary_cartridge = "40mm" AND name__designation = "rpg-29"