The Japanese Yen declined on Tuesday falling against its U.S. counterpart and the Euro as the gap between the country's 30-year bonds and U.S. bonds with the same maturity widened the most in two years amid favourable data from the U.S. showing economic improvement. The Yen slipped 0.4% to 99.57 per U.S. Dollar and it decreased 0.3% to 133.34 per Euro.