public override string ToString()
{
string results = string.Format("Five star: {0} %", _fiveStar.Low) + Environment.NewLine +
string.Format("Four star: {0} %", _fourStar.Low) + Environment.NewLine +
string.Format("Three star: {0} %", _threeStar.Low) + Environment.NewLine +
string.Format("Two star: {0} %", _twoStar.Low) + Environment.NewLine +
string.Format("One star: {0} %", _oneStar.Low) + Environment.NewLine;
return results;
}