2.1.1322 Part 1 Section 20.1.10.24, ST_FixedPercentage (Fixed Percentage)
a. The standard states that ST_FixedPercentage is read and written as a percent with a trailing percent sign.
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Office will read percentages formatted with a trailing percent sign or formatted as 1000th of a percent without a trailing percent sign, but only write percentages as 1000th's of a percent without a trailing percent sign.