Sales fell steadily for 6 years., Sales fell for a few years and then increased., Sales decreased a little, and then rose steadily. They fell again for a year and then increased sharply., Sales increased steadily for six years., Sales went up for a year and then went down. After that, they increased dramatically for two years and then rose slightly last year., Sales rose for a year and then went down. They stayed almost the same for two years. After that, they increased steadily for three years and then rose slightly over the next four years.,

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