The Transportation group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Has Navios Maritime Partners LP (NMM) been one of those stocks this year? By taking a look at the stock's year-to-date performance in comparison to its Transportation peers, we might be able to answer that question.Navios Maritime Partners LP is one of 132 individual stocks in the Transportation sector. Collectively, these companies sit at #16 in the Zacks Sector Rank ...