Cons_per_GDP=df['Const.']/df.GDP*100
Exports_per_GDP=df['Total exports goods and services']/df.GDP*100
df['Cons_per_GDP']=Cons_per_GDP
df['Exports_per_GDP']=Exports_per_GDP
Domestic_Demand_per_GDP_wc=(df['Domestic demand']-df['Const.'])/df.GDP*100
df['Domestic_Demand_per_GDP_wc']=Domestic_Demand_per_GDP_wc
df['trad_op']= (df['Total exports goods and services']+df['Total imports goods and services'])
df['trad_op']= (df['trad_op']/df.GDP*100)
df['pct_change']=(df.GDP.pct_change()*100)