Starbucks Corporation (SBUX) leaves investors disheartened with its lackluster stock performance this year, falling short of the industry and the S&P 500. The company's struggles across all three of its key markets have been a significant drag on its stock.Year to date, Starbucks' stock has declined by 20.2% compared with the industry’s 9.4% drop. In sharp contrast, the S&P 500 increased 15.8% during the same period. As of Jul 22, the stock closed at $76.55, significantly below its 52-week high of$107.66 b ...