I will post here a very informative answer I got from AndreyT on tenforums.com:
According to rainmeter docs, by default "swap usage" actually stands for the sum of RAM usage and swap file usage. So, your readouts indicate that most of the data is currently in RAM and only a small amount has been pushed to swap file.
In any case, there's no such thing as "normal" or "not normal" when it comes to swap file usage. The more "dormant" memory pages you currently have in your virtual memory ("dormant" stands for "occupied, but not currently used"), the higher swap will usage you will observe. This is perfectly normal. As long as your system is running smoothly, without swap thrashing, you are fine.