My formula is
=IF(E$110=2015,Formulas!$B4,
IF(E$110=2016,Formulas!$C4,
IF(E$110=2017,Formulas!$E4,
IF(E$110=2018,Formulas!$E4,
IF(E$110=2019,Formulas!$F4,
IF(E$110=2020,Formulas!$G4,
IF(E$110=2021,Formulas!$H4,
IF(E$110=2022,Formulas!$I4,
IF(E$110=2023,Formulas!$J4,
IF(E$110=#N/A,""))))))))))...