What is the percentage of the actors that showed up in the credit list of movie "Dawn of the Planet of the Apes" that were born after "1970/1/1"?
movie "Dawn of the Planet of the Apes" refers to Title = 'Dawn of the Planet of the Apes'; born after "1970/1/1" refers to Date of Birth > '1970/1/1'; percentage = divide(count(ActorID where Date of Birth > '1970/1/1'), count(ActorID))*100%
SELECT CAST(SUM(CASE WHEN T3.`Date of Birth` > '1970-01-01' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T3.`Date of Birth`) FROM movie AS T1 INNER JOIN characters AS T2 ON T1.MovieID = T2.MovieID INNER JOIN actor AS T3 ON T3.ActorID = T2.ActorID WHERE T1.Title = 'Dawn of the Planet of the Apes'
CREATE TABLE actor
(
    ActorID           INTEGER
        constraint actor_pk
            primary key,
    Name              TEXT,
    "Date of Birth"   DATE,
    "Birth City"      TEXT,
    "Birth Country"   TEXT,
    "Height (Inches)" INTEGER,
    Biography         TEXT,
    Gender            TEXT,
    Ethnicity         TEXT,
    NetWorth          TEXT
);
CREATE TABLE movie
(
    MovieID        INTEGER
        constraint movie_pk
            primary key,
    Title          TEXT,
    "MPAA Rating"  TEXT,
    Budget         INTEGER,
    Gross          INTEGER,
    "Release Date" TEXT,
    Genre          TEXT,
    Runtime        INTEGER,
    Rating         REAL,
    "Rating Count" INTEGER,
    Summary        TEXT
);
CREATE TABLE characters
(
    MovieID          INTEGER,
    ActorID          INTEGER,
    "Character Name" TEXT,
    creditOrder      INTEGER,
    pay              TEXT,
    screentime       TEXT,
    primary key (MovieID, ActorID),
    foreign key (ActorID) references actor(ActorID),
    foreign key (MovieID) references movie(MovieID)
);
