Month Incidence 1 0.9095480949 2 0.6953682909 3 0.277736297 4 0.0703373739 5 0.0227197194 6 0.0192637379 7 0.0474360943 8 0.1960994271 9 0.5780310938 10 0.8791825764 11 0.9570433299 12 0.9622751639