Investors interested in Finance stocks should always be looking to find the best-performing companies in the group. Has Aflac (AFL) been one of those stocks this year? Let's take a closer look at the stock's year-to-date performance to find out.Aflac is a member of our Finance group, which includes 859 different companies and currently sits at #3 in the Zacks Sector Rank. The Zacks Sector Rank considers 16 different groups, measuring the average Zacks Rank of the individual stocks within the sector to gauge ...