Odd first post
Top ten of all time? This year? Last ten years? Law Enforcement market will easily drive up the percentage of certain pistols such as the Glock series in my opinion, and military contracts notwithstanding, the Beretta 92 seems quite popular. The 1911 type pistol is still wildly popular as well.
You would need to Google market shares of handguns in the US by year or something; there's probably a trade paper article out there that breaks it down