Ranking system has been 4 year range for a while like 15 years. Since taking out the Continental Championships results this has been the system. In the past rankings had reduced percentage values each year, but since London 2012 everything is 100%.
VNL results will probably be included this year, minus WGP.
But this was different story back then.
For this year WC '19 won't count (as states fivb) and VNL as well (at least still no news on it). So next ranking will be just OG + WCH (WTH !?!?) which is just 2 competition..............................