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Stock Option Value correlated to net worth of company
There are a LOT of variables at play here, so with the info you've provided we can't give you an exact answer.  Generally speaking, employee options at a startup are valued by a 409a valuation (http://en.wikipedia.org/wiki/Internal_Revenue_Code_section_409A) once a year or more often.  But it's entirely possible that the company split, or took a round of funding that reduced their valuation, or any other number of things.   We'd need a good bit more information (which you may or may not have) to really answer the question.