Over the past five years, revenue has increased in the last three years, operating profit has increased for five consecutive years, and net profit has fallen sharply by 70.5% in 2017, followed by a decline of 11.77% in 2021 after three consecutive years of growth. The sharp drop in net profit in 2017 was mainly due to an income tax of 67 million, compared with an income tax return of 16.55 million the previous year. There are a large number of Bad debt every year, and the write-off has reached more than 40 million in recent years, which has a great impact on net profit, and the income tax has reached nearly 40 million.