public double getValueAt(Key key)
{
int i = 0;
while(i < calcDescription.Count && calcDescription.ElementAt(i).startYear > key.year)
{ i++; }
return calcDescription.ElementAt(i).getValueAt(key);
}
public double getValueAt(Key key)
{
return this.combinator.combineInputs(this.input, key);
}