Hello, I am just looking for an advice regarding my x-axis in power spectrum. I have a time series data from 8 years. In the power spectrum the x axis is is given in hz. I need the x-axis in cycle per year. How to set sampling frequency as one year??

Hello, I am just looking for an advice regarding my x-axis in power spectrum. I have a time series data spanning 8 years of data. In the power spectrum, the x axis is is given in hz. I need the x-axis in cycle per year. How to set sampling frequency as one year??