Elon Musk’s Tesla could hit the trillion-dollar market cap status as soon as next year. Sarah Stier/Getty Images Elon Musk first hit the billionaire club in 2012. Since then, his fortune has grown at a stunning 110 percent per year to more than $244 billion, thanks to the astronomical growth of his two primary businesses, Tesla (TSLA) and SpaceX. Now, the entrepreneur is on track to become the...