There was no specific year that the exclamation mark was invented. It evolved over time from various marks used in ancient manuscripts to indicate emphasis or strong emotion. The earliest known use of a mark similar to the exclamation mark can be traced back to ancient Greek manuscripts, where a raised dot was used for this purpose. Over time, this dot evolved into other shapes, such as a vertical line or a slanted line, and eventually took the form of the exclamation mark we use today.