Speedup read_excel for SMHI data #682 #682

Use openpyxl to read SMHI data.

Note: calamine is only 15% faster which is not worth an additional dependency.

data/issues/emissions/historical_data_calculations.py

@@ -15,7 +15,7 @@ def get_smhi_data(path=PATH_SMHI):
         pandas.DataFrame: The dataframe containing the SMHI data.
     """
 
-    df_raw = pd.read_excel(PATH_SMHI)
+    df_raw = pd.read_excel(path, engine="openpyxl")
 
     # Remove the first 4 rows and reset the index
     df_raw = df_raw.drop([0, 1, 2]).reset_index(drop=True)