Chilean President Sebastian Piñera will leave office March 11 with high popularity and one of the best economic records in Latin America. So when I interviewed him a few a days ago, I was curious to know what was his recipe, and why — after achieving such good macro-economic figures —- did the opposition win the Dec. 15 elections by a landslide. Piñera, a center-right billionaire businessman, will leave behind a country growing at 5 percent annually, a 3 percent inflation rate and having raised the per…