Based on economists forecasts and analysis, one-year Treasury bill rates and liquidity premiums for the next four years are expected to be as follows:

1R1 =	0.37%
E(2r1) =	0.62%	L2 =	0.04%
E(3r1) =	0.72%	L3 =	0.15%
E(4r1) =	1.02%	L4 =	0.18%

Calculate the yield to maturity for four years.