Decimal Operations · Challenge problem

The nine numbers $0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6$ and $1.8$ are placed in a $3 \times 3$ grid, one in each square. Every row, every column and both diagonals add up to the same total. What number is in the centre square?