Piano grades?

I studied piano privately for 8-9 years and never took any exams, I did not play for many many years and about a year ago I started to play again. I'm just wondering roughly what grade you think I might be - I find Beethoven Sonata op. 49 n.2, Moonlight Sonata and Fur Elise easy, I did not find Chopin Nocturne op. 9 n. 2 too hard, I was able to play Debussy Arabesque n.1 quite well and am now learning it again together with Beethoven's Sonata Patethique. I'm quite happy to play just for myself but I'm curious... Thanks!