Construct a line graph using the data from this dataframe, where the x-axis is years and the y-axis is the columns hapscore = pd.DataFrame({'2015': [df15['Happiness Score'].mean()], '2016': [df16['Happiness Score'].mean()], '2017': [df17['Happiness.Score'].mean()], '2018': [df18['Score'].mean()], '2019': [df19['Score'].mean()]}) 2015 2016 2017 2018 2019 0 5.375734 5.382185 5.354019 5.375917 5.407096

def graph(x, y):
    plt.plot(x, y)
    plt.show()
    
graph(hapscore.columns, hapscore.loc[0])