Total population across SAARC in 1990 and 2020

total population saarc region

plt.rcParams["figure.figsize"] = (12, 6)
plt.rcParams["font.size"] = 14
colors = ["red","green","gold","orange","blue","skyblue","maroon","grey"]

fig, ax = plt.subplots()
df_pop.T.plot.bar(stacked = True, ax = ax, color = colors)
ax.set_ylabel("Population")
ax.xaxis.set_ticklabels(ticklabels = [1990, 2020], rotation = 0)

for i in range(len(df_pop)):          
    
    if i==0:
        ax.fill_between(x = [0.25, 0.75],
                        y1 = [0, 0],
                        y2 = [df_pop.iloc[0, 0], df_pop.iloc[0, 1]],
                        color = colors[i],
                       alpha = 0.2)
    
    elif i!=7:
        ax.fill_between(x = [0.25, 0.75],
                        y1 = [df_pop.iloc[:i, 0].sum(), df_pop.iloc[:i, 1].sum()],
                        y2 = [df_pop.iloc[:i+1, 0].sum(), df_pop.iloc[:i+1, 1].sum()],
                       color = colors[i],
                       alpha = 0.2)
        
    else:
        ax.fill_between(x = [0.25, 0.75],
                       y1 = [df_pop.iloc[:i, 0].sum(), df_pop.iloc[:i, 1].sum()],
                       y2 = [df_pop[1990].sum(), df_pop[2020].sum()],
                       color = colors[i],
                       alpha = 0.2)
    
ax.annotate(text = f"{round(df_pop[1990].sum()/10**9, 2)} billion",
           xy = (-0.1,df_pop[1990].sum()*1.1))

ax.annotate(text = f"{round(df_pop[2020].sum()/10**9, 2)} billion",
           xy = (0.9,df_pop[2020].sum()*1.05))

ax.spines["right"].set_color("white")
ax.spines["top"].set_color("white")
plt.tick_params(color = "white")
plt.title("Total population in SAARC region\n 1990 and 2020", pad = 20, fontdict = {"weight":"bold", "size":20})
plt.legend(bbox_to_anchor = (0.85, -0.1), ncol = 4)
plt.show()