Table: jim_clark_racing_data
Columns: year
entrant
chassis
engine
pts

Question: What year has 54 (73) points?
SQL: SELECT SUM("year") FROM jim_clark_racing_data WHERE "pts" = '54 (73)'

Question: What is the chassis more recent than 1967?
SQL: SELECT "chassis" FROM jim_clark_racing_data WHERE "year" > 1967

Question: What is the year of the Lotus 25 chassis?
SQL: SELECT AVG("year") FROM jim_clark_racing_data WHERE "chassis" = 'lotus 25'

Question: What is the year of the Lotus 18 chassis?
SQL: SELECT COUNT("year") FROM jim_clark_racing_data WHERE "chassis" = 'lotus 18'