PERCENTw.d

w  宽度（要包括正负号和%）specifies the width of the output field.

Default:	6
Range:	4-32
Tip:	The width of the output field must account for the percent sign (% ) and parentheses for negative numbers, whether the number is negative or positive.

d  可选项，小数位数specifies the number of digits to the right of the decimal point in the numeric value. This argument is optional.

Range:	0-31
Requirement:	must be less than w

The PERCENTw.d format multiplies values by 100, formats them the same as the BESTw.d format, and adds a percent sign (%) to the end of the formatted value, while it encloses negative values in parentheses.

Examples

put @10 gain percent10.;

Value of x	Results
	----+----1----+----2
0.1	10%
1.2	120%
-0.05	(      5%)

PERCENTNw.d

Syntax Description
wspecifies the width of the output field.

Default:	6
Range:	4-32
Tip:	The width of the output field must account for the minus sign ( - ), the percent sign ( % ), and a trailing blank, whether the number is negative or positive.

dspecifies the number of digits to the right of the decimal point in the numeric value. This argument is optional.

Range:	0-31
Requirement:	must be less than w

put x percentn10.;

Value of x	Results
-0.1	-10%
.2	20%
.8	80%
-0.05	-5%
-6.3	-630%

详细参考：
http://support.sas.com/documentation/cdl/en/lrdict/63026/HTML/default/viewer.htm#a002980019.htm