code:

# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
import fredpy as fp

fp.api_key = 'getyourown'

fl = fp.series('flphci')
ne = fp.series('nephci')

win = ['01-01-1980','01-01-2200']
fl_win = fl.window(win)
ne_win = ne.window(win)

flne = fl_win.divide(ne_win)
flne = flne.ma(12)
flne = flne.pc(annualized=True)

fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ax.plot(flne.data,'-', lw=2)
ax.grid()
ax.set_title('FL vs NE')

flne.recessions()