#!/usr/bin/python

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as tkr

def formatNumbers(x, pos):
	return "{number:1,.0f}".format(number=x)

data = [
         (1801, 82430),
         (1811, 101065),
         (1821, 129007),
         (1831, 180222),
         (1841, 255492),
         (1851, 320513),
         (1861, 429881),
         (1871, 539248),
         (1881, 648616),
         (1891, 659967),
         (1901, 711030),
         (1911, 766044),
         (1921, 805066),
         (1931, 846101),
         (1941, 806271),
         (1951, 768337),
         (1961, 683133),
         (1971, 607454),
         (1981, 503726),
         (1991, 480196),
         (2001, 439476),
         (2011, 466415),
       ]

years = []
values = []

for datum in data:
	years.append(datum[0])
	values.append(datum[1])

yearLabels = np.arange(len(years))
offset = 0.35

fig, ax = plt.subplots()
fig.set_size_inches(8, 4.5)

yearBars = ax.bar(yearLabels, values, color="r")
ax.set_xticks(yearLabels + offset)
ax.set_xticklabels(years, rotation=90)

plt.tick_params(axis="x", which="both", bottom="off", top="off")
ax.yaxis.set_major_formatter(tkr.FuncFormatter(formatNumbers))
plt.savefig("LiverpoolPopulationHistory.svg")