2.1.1788 Part 4 Section 17.2.2.11, ST_TextSpacingPercent (Text Spacing Percent)

a.   The standard states that the ST_TextSpacingPercent simple type specifies the range that the spacing percent in terms of line in hundredths.

Office uses this type to specify the percent of a line height in thousands of a percent.

b.   The standard states that ST_TextSpacingPercent is read and written as a percent with a trailing percent sign.

Office will read in percentages formatted with a trailing percent sign or as 1000th of a percent without trailing percent sign, but only write out percentages as 1000th's of a percent without trailing percent sign.