The graph shows it doubling since april this year (29.635 in april; 58.646 current). the bar on the side shows silver increased 4% today
But I understand silver market is highly volatile and can be somehow manipulated. Gold can increase from 5% to 10% per year being more stable but I think you need to invest a lot at start to notice the difference.
I'm thinking to invest in one of those metals but I'll read more before doing it