For the last 14 months in Peru, the value of the U.S. dollar has been tanking. That trend really hurts when you’re an expat, like me, who still keeps a bank account in the U.S. When El Fotógrafo and I arrived in Lima in July 2007, the dollar was trading at 3.3 Peruvian soles. We didn’t realize at the time, but that was a sweet exchange rate. A few months later, the dollar started dipping in value. We were shocked when it went under 3 soles. Then it began dropping more, all the way to 2.65 soles. The official money changers (see guy in green vest, above) we traded with…