/// <inheritdoc />
public override string ToString()
{
string ratesPart = Rates.Aggregate("", (acc, curr) =>
$"{acc}{Environment.NewLine}{curr.Key.ToShortDateString()}: {DayRates.RatesToString(curr.Value)}");
return($"{StartAt.ToShortDateString()}–{EndAt.ToShortDateString()} exchange rates for 1 {Base} " +
ratesPart);
}