You will be given a definition of a task first, then some input of the task.
In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: China Airlines (CAL) () is the national carrier of Taiwan (officially the Republic of China, hence the "China" name), and one of its two major airlines along with EVA Air. It is headquartered in Taiwan Taoyuan International Airport and operates over 1400 flights weekly (including 91 pure cargo flights) to 102 cities across Asia, Europe, North America and Oceania. Carrying over 19 million passengers and 5700 tons of cargo in 2017, the carrier was the 33rd and 10th largest airline in the world in terms of passenger revenue per kilometer (RPK) and freight RPK, respectively. China Airlines has three airline subsidiaries: China Airlines Cargo, a member of SkyTeam Cargo, operates a fleet of freighter aircraft and manages its parent airline's cargo-hold capacity; Mandarin Airlines operates flights to domestic and low-demand regional destinations; Tigerair Taiwan is a low-cost carrier established by China Airlines and Singaporean airline group Tigerair Holdings, but is now wholly owned by China Airlines Group.
 Link Information: none Question: How many passengers did the airport where China Airlines is headquarter handle in 2017?
Output:
Answer: none