MAT Growth formula challenges

[george456]

Dear Community

I am need some guidance on the below formula:

I am using this to create a rolling MAT Value by Month and it works fine. The formula is:

=sum(if(Year2Date(PERIOD,0,if(MONTH(LatestDate)>11,1,MONTH(LatestDate)+1),LatestDate),$(vMeasure)))

My output is as follows: 

MANUFACTURER	MonthYr	Aug 2018	Sep 2018	Oct 2018	Nov 2018	Dec 2018	Jan 2019	Feb 2019	Mar 2019	Apr 2019	May 2019	Jun 2019	Jul 2019
Manufac 1		907,700,199	916,079,988	925,411,401	934,516,386	942,949,693	950,110,401	955,958,829	961,816,170	964,160,990	968,366,379	970,790,467	972,803,259

I need to find a way to calculate the % growth between Jul 2019 vs Jul 2018

Please help