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 =	0.50%
E(2r1) =	0.91%	L2 =	0.06%
E(3r1) =	1.01%	L3 =	0.17%
E(4r1) =	1.31%	L4 =	0.19%

Calculate the yield to maturity for four years