What is the density of ?
CREATE TABLE table_43599 (
    "Name" text,
    "Hanzi" text,
    "Hanyu Pinyin" text,
    "Population (2004 est.)" text,
    "Area (km\u00b2)" text,
    "Density (/km\u00b2)" text
)
SELECT "Density (/km\u00b2)" FROM table_43599 WHERE "Hanzi" = '昌黎县'
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 density of ? ### Input: CREATE TABLE table_43599 (
    "Name" text,
    "Hanzi" text,
    "Hanyu Pinyin" text,
    "Population (2004 est.)" text,
    "Area (km\u00b2)" text,
    "Density (/km\u00b2)" text
) ### Response: SELECT "Density (/km\u00b2)" FROM table_43599 WHERE "Hanzi" = '昌黎县'