最后一个数据点无法显示symbol echarts 折线配置项内容和展示

5分这个应该显示2%，现在最后一个节点不显示

      option = {
    title: {
        left: 'center',
        text: 'test',
        textStyle: {
            fontSize: 14
        }
    },
    color: ['ff0000', '33ff00', '#0033FF', '#F709F7'],
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        orient: 'horizontal',
        x: '20%',
        y: '10%',
        data: ['test1']
    },
    xAxis: {
        type: 'category',
        data: ['1', '2', '3', '4', '5']
    },
    yAxis: [
        {
            type : 'value',
            axisLabel : {
                formatter: '{value} %'
            }
        }
    ],
    series: [
        {
            name: 'test1',
            type: 'line',
            smooth: true,
            itemStyle: {
                normal: {
                    color: "#FF00FF",
                    lineStyle: {
                        color: "#FF00FF"
                    }
                }
            },
            label:{
                show:true,
                formatter: function( data ) {
                    return data.data+'%';
                }
            },
            data:[1,2,90,5,2]
        }
    ]
};