What is the average Year for the Royal Canadian Mint Engravers Artist when the Mintage is under 200?
CREATE TABLE table_54945 (
    "Year" real,
    "Artist" text,
    "Composition" text,
    "Mintage" real,
    "Issue Price" text
)
SELECT AVG("Year") FROM table_54945 WHERE "Artist" = 'royal canadian mint engravers' AND "Mintage" < '200'
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 average Year for the Royal Canadian Mint Engravers Artist when the Mintage is under 200? ### Input: CREATE TABLE table_54945 (
    "Year" real,
    "Artist" text,
    "Composition" text,
    "Mintage" real,
    "Issue Price" text
) ### Response: SELECT AVG("Year") FROM table_54945 WHERE "Artist" = 'royal canadian mint engravers' AND "Mintage" < '200'