Setting Y-axis Scale from 0 to 100 - Proc Shewhart

[guaguncher]

I wanted to set a y-axis running from 0% to 100% for all my control charts using Proc Shewhart. However, it seems that the y-axis scale only ranges across the maximum and minimum of the dataset. Here are two codes I have tried:

ods graphics off; 
title 'Percentage of Hypertensive Patients with Scheduled Appointment'; 
symbol v=dot color=darkblue h=1.75; 
proc shewhart data=percentages;
	xchart a*b/ interval = month climits=red nolimitlabel nolegend vformat = percent10. vaxis = (0 to 1 by 0.1);
	label a='XXX' b = 'YYY'; 
run;

ods graphics off;
title 'ZZZ'; /*TITLE TO THE CHART*/
axis1 order = (0 to 1 by 0.1)
label=("XXX");
axis2 label = ("YYY"); 
symbol v=dot color=darkblue h=1.75; /*SYMBOL TYPE, COLOR AND DIAMETER*/
proc shewhart data=percentages;
xchart a*b/vaxis = axis1 haxis=axis2 interval = month climits=red nolimitlabel nolegend vformat=percent10.; 
run; 

[PaigeMiller]

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