坐标点溢出找不到了？echarts 配置项内容和展示

我另一条折线的数据为[31,0.75] 为什么该坐标点找不到了

      option = {
    xAxis: {
        data: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]
    },
    yAxis: {
    },
    series: [
        {"name":"2018年06月","type":"line","data":[[1,0.36],[2,-0.54],[3,-0.32],[4,0.11],[5,-0.07],[6,0.11],[7,0.11],[8,0.01],[9,-0.2],[10,-0.39],[11,0.15],[12,0.33],[13,0.46],[14,0.31],[15,0.94],[16,0.14],[17,-0.19],[18,0.28],[19,0.49],[20,0.47],[21,0.19],[22,0.07],[23,-0.1],[24,-0.75],[25,0.07],[26,0.14]]},
        {"name":"2018年05月","type":"line","data":[[31,0.75]]},
    ]
};