What is the lowest year that regular season is 4th, Rocky Mountain?
CREATE TABLE table_17667 (
    "Year" real,
    "Division" real,
    "League" text,
    "Regular Season" text,
    "Playoffs" text,
    "Open Cup" text
)
SELECT MIN("Year") FROM table_17667 WHERE "Regular Season" = '4th, Rocky Mountain'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the lowest year that regular season is 4th, Rocky Mountain? ### Input: CREATE TABLE table_17667 (
    "Year" real,
    "Division" real,
    "League" text,
    "Regular Season" text,
    "Playoffs" text,
    "Open Cup" text
) ### Response: SELECT MIN("Year") FROM table_17667 WHERE "Regular Season" = '4th, Rocky Mountain'