SPS:Swap.HIVE = 900,000 SPS per month
SPS:DEC = 700,000 SPS per month
DEC:Swap.HIVE = 200,000 SPS per month
These are rough estimates, they should be decreasing by 1% a month. so they're all a bit lower than that in reality. Not sure it's really worth the time to go ask a Splinterlands dev to pull the exact number for this.
I'd say somewhere between 1.5m and 1.8m SPS per month is a reasonable approximation.