SELECT host_city FROM hosting_city ORDER BY YEAR DESC LIMIT 1
What is id of the city that hosted events in the most recent year?
[Schema (values) (types)]: | city_record |  city : city_id (text) , city (number) , hanzi (text) , hanyu_pinyin (text) , regional_population (text) , gdp (number) | match : match_id (text) , date (number) , venue (text) , score (text) , result (text) , competition (number) | temperature : city_id (text) , jan (number) , feb (text) , mar (text) , apr (text) , jun (number) , jul (number) , aug (number) , sep (text) , oct (text) , nov (text) , dec (text) | hosting_city : year (text) , match_id (number) , host_city (text);