Which average Opened has a Manufacturer of vekoma?
CREATE TABLE table_name_19 (opened INTEGER, manufacturer VARCHAR)
SELECT AVG(opened) FROM table_name_19 WHERE manufacturer = "vekoma"
### Context: CREATE TABLE table_name_19 (opened INTEGER, manufacturer VARCHAR) ### Question: Which average Opened has a Manufacturer of vekoma? ### Answer: SELECT AVG(opened) FROM table_name_19 WHERE manufacturer = "vekoma"