Stacked bar

plt.figure(figsize=(10, 8))
plt.style.use('bmh')
SMALL_SIZE = 12
MEDIUM_SIZE = 16
BIGGER_SIZE = 18

plt.rc('font', size=SMALL_SIZE)          # controls default text sizes
plt.rc('axes', titlesize=SMALL_SIZE)     # fontsize of the axes title
plt.rc('axes', labelsize=MEDIUM_SIZE)    # fontsize of the x and y labels
plt.rc('xtick', labelsize=SMALL_SIZE)    # fontsize of the tick labels
plt.rc('ytick', labelsize=SMALL_SIZE)    # fontsize of the tick labels
plt.rc('legend', fontsize=SMALL_SIZE)    # legend fontsize
plt.rc('figure', titlesize=BIGGER_SIZE)  # fontsize of the figure title

years1 = [str(2009+i) for i in range(1, 8)]
years2 = [str(2016+i) for i in range(1, 8)]
ind1 = [year for year in years1]
ind2 = [year for year in years2]
data11 = np.array([92767,95443,98028,101099,110768,114209,117456])
data12 = np.array([122577,125106,132925,142123,144391,150075,161593])
data21 = np.array([2676,2585,3070,9669,3441,3248,5119])
data22 = np.array([2348,7819,9198,2268,5684,11518,12500])

plt.bar(ind1, data21, width=0.6, label='Acréscimo verificado', bottom=data11, color='#9FC1D6')
plt.bar(ind1, data11, width=0.6, color='#5F99BC')
plt.bar(ind2, data22, width=0.6, label='Acréscimo previsto', bottom=data12, color='#5FBC81')
plt.bar(ind2, data12, width=0.6, color='#5F99BC')

#plt.xticks(ind, years)
plt.ylabel("Linhas de transmissão (km)")
plt.legend(loc="upper left")
plt.title("Evolução do Sistema Interligado Nacional (SIN)", fontdict={'fontsize':BIGGER_SIZE})
plt.show()