Depends how I do have to interpret your question.
Regardless of your Steem Power, you do start with a voting power of 100%. Each time when you do give a full upvote, your voting power is decreased with around 2%. Each 2,4 hours (or there about) you will gain 2%. So by not being upvoting your voting power increases.
On the other side you have the value of your voting power. This can be increased by accumulating Steem Power. (Converting steem to steem power, the so called powering up!)
Steemnow.com will give you a good insight in the value of your votes and the voting power!