Calculates an estimated monthly Social Security Benefit based on a smooth estimate of pay over your work history.
Also calculates a covered compensation amount based on a year of birth

Given a set of times and survival population counts, the calculator will determine the following:
Survival Population l_x
Mortality Population d_x
Survival Probability p_x
Mortality Probability q_x
In addition, the calculator will determine the probability of survival from t_x to t_{x + n}