Enter a formula in cell g5 that calculates the difference between the attendance totals for 2018 and 2017.copy the formula range to g6: g11

we will write year in column B and column c respectively

2017 and 2018

then we will add months of year from January to December in the cells range from A2 to A13

then we will choose cell g5 and will write the diffrence formula

g5=cells with total  attendance of 2018-cells with total  attendance of 2017"

then finally we will use fill handle and drag the difference formula and copy the formula from g6:g12

look at attached file

what is your question exactly? when you let me know i will gladly you. : )