What's the average Year with an Issue Price (Proof) of $49.95, and Artist of W.H.J. Blakemore?
CREATE TABLE table_10824 (
    "Year" real,
    "Artist" text,
    "Mintage (Proof)" text,
    "Issue Price (Proof)" text,
    "Mintage (BU)[ clarification needed ]" text,
    "Issue Price (BU)[ clarification needed ]" text
)
SELECT AVG("Year") FROM table_10824 WHERE "Issue Price (Proof)" = '$49.95' AND "Artist" = 'w.h.j. blakemore'
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's the average Year with an Issue Price (Proof) of $49.95, and Artist of W.H.J. Blakemore? ### Input: CREATE TABLE table_10824 (
    "Year" real,
    "Artist" text,
    "Mintage (Proof)" text,
    "Issue Price (Proof)" text,
    "Mintage (BU)[ clarification needed ]" text,
    "Issue Price (BU)[ clarification needed ]" text
) ### Response: SELECT AVG("Year") FROM table_10824 WHERE "Issue Price (Proof)" = '$49.95' AND "Artist" = 'w.h.j. blakemore'