The SNB held 4 percent both in Canadian dollars and sterling, and 9 percent in Japanese yen, similar to the previous quarter, the data also showed. How the SNB has its reserves invested is closely watched after it was sharply criticised for running up its biggest annual loss ever in 2010 due to its interventions to weaken the Swiss franc. The SNB implemented a cap of 1.20 francs per euro on Sept. 6, 2011. So far that ceiling has held. The SNB had 82 percent of its reserves invested in government bonds, compared with 84 percent a quarter earlier, the data showed. Of its debt holdings, 83 percent were invested in bonds with an AAA rating and 13 percent with an AA rating, nearly unchanged from a quarter earlier.