Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_52 (year INTEGER, category VARCHAR)
### Question:
What was the total number of years than had best improved singer (躍進歌手)?
### Answer:
SELECT SUM(year) FROM table_name_52 WHERE category = "best improved singer (躍進歌手)"