SELECT Year, COUNT(Year) FROM exhibition WHERE Ticket_Price < 15 GROUP BY Year
Find those years for all exhibitions with ticket prices lower than 15, return a bar chart that groups by year and counts the total number of years.
CREATE TABLE artist (
    Artist_ID int,
    Name text,
    Country text,
    Year_Join int,
    Age int
)

CREATE TABLE exhibition (
    Exhibition_ID int,
    Year int,
    Theme text,
    Artist_ID int,
    Ticket_Price real
)

CREATE TABLE exhibition_record (
    Exhibition_ID int,
    Date text,
    Attendance int
)