The chart below gives information about "Istanbul Promo plus" sales in 2007. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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The given chart illustrates the revenue of "Istanbul Promo Plus" in 2007.

Overall, it can be seen that the number of sales saw a downward trend over the period shown. Moreover, the sales of "Istanbul Promo Plus" in March was highest.

It is observed that there was a slight rise in the number of sales from 200 millions to 225 millions of Turkish lira from January to February, after which this figure continued to rise rapidly from 225 millions to 350 millions of Turkish lira from February to March. However, the number of sales decreased dramatically by 225 millions of Turkish lira over a period of 5 months, from March. In contrast, there was an upward trend in 5 months later. There was a slight rise from about 125 millions to about 225 millions of Turkish lira from July to August. The month September saw a slow drop in the "Istanbul Promo Plus" sales from about 225 millions of Turkish lira in August to 125 millions of Turkish lira. This figure increased slowly from 125 millions to 175 millions of Turkish lira from September to October. Furthermore, this figure was unchanged from October to November. In addition, the sales of "Istanbul Promo Plus" increased slowly from 175 millions to about 200 millions of Turkish lira in December.