When in doubt, use a 10% growth rate.
If you haven't built a business plan that includes an expected growth rate or goal, enter 10%.
10% is an industry-acceptable standard rate to use that encapsulates both market lift and organic growth. If you would prefer to be a little more conservative (perhaps in anticipation of a market correction), you may use a lower number. If you have been growing historically at a higher rate, feel free to use a number greater than 10%.