=IF(
ROW()-ROW(Table1[#Headers])<12,
NA(),
(1+INDEX([Monthly RR],ROW()-ROW(Table1[#Headers])))*
(1+INDEX([Monthly RR],ROW()-ROW(Table1[#Headers])-1))*
(1+INDEX([Monthly RR],ROW()-ROW(Table1[#Headers])-2))*
(1+INDEX([Monthly RR],ROW()-ROW(Table1[#Headers])-3))*
(1+INDEX([Monthly...