CREATE TABLE manager (Manager_ID INT, Name TEXT, Country TEXT, Working_year_starts TEXT, Age INT, Level INT)
CREATE TABLE railway (Railway_ID INT, Railway TEXT, Builder TEXT, Built TEXT, Wheels TEXT, Location TEXT, ObjectNumber TEXT)
CREATE TABLE railway_manage (Railway_ID INT, Manager_ID INT, From_Year TEXT)
CREATE TABLE train (Train_ID INT, Train_Num TEXT, Name TEXT, From TEXT, Arrival TEXT, Railway_ID INT)

Show the working years of managers in descending order of their level, and count them by a line chart
SELECT Working_year_starts, COUNT(Working_year_starts) FROM manager ORDER BY Level DESC
SELECT "Working_year_starts", COUNT("Working_year_starts") FROM "manager" ORDER BY "Level" DESC NULLS LAST