What is the year of the Lotus 18 chassis?
CREATE TABLE table_name_97 (year VARCHAR, chassis VARCHAR)
SELECT COUNT(year) FROM table_name_97 WHERE chassis = "lotus 18"
### Context: CREATE TABLE table_name_97 (year VARCHAR, chassis VARCHAR) ### Question: What is the year of the Lotus 18 chassis? ### Answer: SELECT COUNT(year) FROM table_name_97 WHERE chassis = "lotus 18"