It is good to have non technical people asking questions. Sometimes when giving an answer it is not obvious that it may not be understood.
Great graph by the way
So, to be super clear,
with PoSV, the target amount of interest to earn on the amount held is 5-6% per ~annum~
I say target, because one of the factors of PoSV is that it is NOT a fixed interest rate.
That is, the amount generated is not a flat interest rate like some POS coins.
Another reference on PoSV to digest (http://agroff.github.io/posv/)
The interest rate is not random, and is cleverly calculated,
The times that you stake will be random, as everyone who is staking is in the race to generate a block.
Sometimes you will stake frequently, and other times, not.
The goal of PoSV is to encourage coin movement, when coins are too young or too old it will affect the stake reward.
That is, depending how long your coins have been in your wallet, an adjusted weight will be applied.
The optimum age is about 7days and this will give you maximum reward.
Take a look at the reference i provided above there is some more good info in there