Here are the comparative condensed income statements of Riverbed Corp. Prepare a horizontal analysis of the income statement data for Riverbed Corp, using 2021 as a base. (If amount and percentoge are a decrease show the numbers as negative, e.g. 55,000,20% or (55,000), (20\%). Round percentages to 1 decimal place, e.g. 12.1\%.) Prepare a horizontal analysis of the income statement data for Riverbed Corp, using 2021 as a base. (If amount and percen are a decrease show the numbers as negative, e.g. 55,000,20% or (55,000), (20\%). Round percentages to 1 decim place, e.g. 12.1\%.)