What does "at a year high" mean?
"At a [number]-[time period]-high" is an expression used to indicate that something is at its highest peak or level in [number]-[time period]. For example, "violent crime is at a five-year high" can be understood as meaning that violent crime has reached its highest level in a period of five years. Ex: Our company earnings are at a ten-year high. Ex: Because of the pandemic, economic growth has reached a two-month low.