Yes, there won't be much if any as mentioned.
From the details I uploaded these are the May records:
I see an "overlap" for Season ending in 2015 of payments made in 2012 and 2013.
I think those two payments in 2013 were incorrectly entered.
All Collegiate members receive 4 years (4 seasons) of memberships.
MemberType Season MembershipNumber PaymentDate EndDate Collegiate 2015 1144627 15-May-12 30-Jun-15 Collegiate 2015 1005705 16-May-12 30-Jun-15 Collegiate 2015 1099838 16-May-12 30-Jun-15 Collegiate 2015 6436112 07-May-13 30-Jun-15 Collegiate 2015 1252333 28-May-13 30-Jun-15 Collegiate 2016 6302859 01-May-13 30-Jun-16 Collegiate 2016 8919316 01-May-13 30-Jun-16 Collegiate 2017 1060155 02-May-14 30-Jun-17 Collegiate 2017 8746552 03-May-14 30-Jun-17 Collegiate 2017 1068751 07-May-14 30-Jun-17 Collegiate 2017 1276092 09-May-14 30-Jun-17 Collegiate 2017 6512612 15-May-14 30-Jun-17 Collegiate 2017 1530334 25-May-14 30-Jun-17 These too:
Collegiate 2015 1131963 28-Jun-12 30-Jun-15 Collegiate 2015 1257570 11-Jun-13 30-Jun-15 Collegiate 2015 1257585 11-Jun-13 30-Jun-15
Collegiate 2016 6450162 06-Jun-13 30-Jun-16 Collegiate 2016 1277151 10-Jun-13 30-Jun-16 Collegiate 2016 1504335 11-Jun-13 30-Jun-16 Collegiate 2016 6005880 11-Jun-13 30-Jun-16 Collegiate 2016 6015490 11-Jun-13 30-Jun-16 Collegiate 2016 6027921 11-Jun-13 30-Jun-16 Collegiate 2016 6302489 11-Jun-13 30-Jun-16 Sorry, I'm not following how the formula captures any payments made in May or Jun?