For how many years did Detroit have a passenger fare of $307.29?
CREATE TABLE table_name_99 (year INTEGER, detroit__dtw_ VARCHAR)
SELECT SUM(year) FROM table_name_99 WHERE detroit__dtw_ = "$307.29"
### Context: CREATE TABLE table_name_99 (year INTEGER, detroit__dtw_ VARCHAR) ### Question: For how many years did Detroit have a passenger fare of $307.29? ### Answer: SELECT SUM(year) FROM table_name_99 WHERE detroit__dtw_ = "$307.29"