Load table

        Keeps only rows with annual average defined (full year data available).

        Returns:
            pandas.DataFrame: loaded data

def load(self):
        """Load table

        Keeps only rows with annual average defined (full year data available).

        Returns:
            pandas.DataFrame: loaded data
        """
        df = pd.read_excel(self.input_file, skiprows=11)
        df = df.dropna(subset=['Annual'])
        return df