Please help with the below question and formula.

Capital Records is reviewing its annual returns and need to calculate the growth or loss over the years. Given the following returns, what is the variance? Year 1 = 13%; year 2 = 1%; year 3 = -26%; year 4 = -1%.

.0323 .0320

.0275

.0456

0.876

.0201

.0249

.0268