 Initial Deposit: Amount invested at the start.
 Yearly Additions: Additional amount invested every year.
 Investment Return: Rate of return on your investment.
 Years: Total number of years.
 # of Simulations: Number of times the simulation is run.
 Return Variation: How much the return varies every year. For example,
a return variation of 20% with an investment return of 10% will randomly
give a return between 0 and 20% every year.
