Pandora sales in the United States grew 72.6 percent in 2010, according to the company’s annual financial report.The United States remains Pandora’s largest market. The charm maker earned $354.7 million last year, an 86.2 percent bump from 2009. Revenue from silver and gold bracelets jumped 50.3 percent; revenue from rings rose a startling 281.8 percent.The company also promised to further its reach in 2011 via “website, e-commerce, Pandora Club, and social media activities” as well as increased Pandora-branded points of sale.