CREATE TABLE exhibition (Exhibition_ID NUMBER, Year NUMBER, Theme CLOB, Artist_ID NUMBER, Ticket_Price FLOAT)
CREATE TABLE artist (Artist_ID NUMBER, Name CLOB, Country CLOB, Year_Join NUMBER, Age NUMBER)
CREATE TABLE exhibition_record (Exhibition_ID NUMBER, Date CLOB, Attendance NUMBER)

Group by the theme and count the year with a stacked bar chart, and show from high to low by the the number of year please.
SELECT Year, COUNT(Year) FROM exhibition GROUP BY Theme ORDER BY COUNT(Year) DESC
SELECT "Year", COUNT("Year") FROM "exhibition" GROUP BY "Theme" ORDER BY COUNT("Year") DESC