Statistics like that will always fluctuate from time-to-time since they correlate directly with the increase or decrease in market competition. Point being: probabaly less than 10% succeed, especially since corps have effectively monopolized most major and minor markets. All this being said, the answer is simple: develop and maintain a strong enough foothold in one market and then expand into others. Always adapt to the market landscape. Find weak points in competitors business models and exploit. Then find ways to maintain fundamentals.