function onSortChange({ order, prop }) {
const sortTypeMap = {
'thisYearIncome': { 'descending': 1, 'ascending': 2 },
'lastYearIncome': { 'descending': 3, 'ascending': 4 },
'rate': { 'descending': 5, 'ascending': 6 }
};

const sortType = sortTypeMap[prop][order];
this.fetchData(sortType);
}