Background
The Bitcoin was created on 3 January 2009 by Satoshi Nakamoto, the real purpose was to create a currency that will not be controlled by any banking system, Or you can simply say a currency that does not have a third party involved. This means that one person can easily send money to another person directly, quickly and at a low fee.

Bitcoin VS Paper Money
The federal reserve bank of the united states can print paper money at any time, ie increase the supply of dollar currency at any time.
But this cannot be done in the case of bitcoin BTC  Its supply is increasing by only 1.79% every year and will decrease even more next year. According to Bitcoin Wiki This is the reason that Bitcoin is the most valuable currency in the world.

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Date:	Price in usd:	Wiki notes:
_____________________	_____________________	_____________________
Jan 2009 - Mar 2010	No Value	No exchanges or market.
Mar 2010	$0.003	BitcoinMarket.com started operating as the first bitcoin exchange.
May 2010	$0.01	On 22 May 2010, Laszlo Hanyecz made the first real-world transaction by buying two pizzas in Florida, for 10,000 BTC
July 2010	$0.008–$0.08	Price skyrocketed by 900% in five days.
October 2010	$0.125	Price surpasses
Feb 2011 - Apr 2011	$1.00	The bitcoin takes parity with US dollar
8 June 2011	$31.00	Top of the first "bubble", followed by a price drop.
Dec 2011	$2.00	Minimum reached in December after the June bubble.
Dec 2012	$13.00	Slow year-long rise.
11 April 2013	$266	Top of a price rally which saw a 5–10% daily growth.
May 2013	$130	Price mostly stable with a slow rise.
June 2013	$100	Price slowly dropped to $70 in June before rising to $110 in July.
Nov 2013	$350–$1,242	Price slowly dropped to $70 in June before rising to $110 in July.
Dec 2013	$600–$1,000	Price crashed to $600, rebounded to $1,000, crashed again to the $500 range. Stabilized to the $650–$800 range.
Jan 2014	$750–$1,000	Price spiked to $1000 briefly, then settled in the $800–$900 range for the rest of the month.
Feb 2014	$550–$750	Price crashed following the shutdown of Mt. Gox before recovering to the $600–$700 range.
Mar 2014	$450–$700	Price continued to fall due to a false report regarding bitcoin ban in China.
Apr 2014	$340–$530	The lowest price since the 2012–2013 Because of Cypriot financial crisis.
May 2014	$440–$630	The downtrend first slows down and then reverses, increasing over 30% in the last days of May.
Mar 2015	$200–$300	Price fell through to early 2015.
Nov 2015	$395–$504	Large spike in value from $225–$250 at the start of October to the 2015 record high of $504.
May–June 2016	$450–$750	Large spike in value starting from $450 and reaching a maximum of $750
July–Sept 2016	$450–$750	Price stabilized in the low $600 range.
Oct–Nov 2016	$600–$780	As the Chinese Renminbi depreciated against the US dollar, bitcoin rose to the upper $700s.
January 2017	$800–$1,150	-
March 2017	$1,290+	Price broke above the Nov 2013 high of $1,242 and then traded above $1,290.
20 May 2017	$2,000	The price passed $2,000 for the first time.
May–June 2017	$2,000–$3,200+	Price reached an all-time high of $3,000 on 12 Jun and is oscillating around $2,500 since then. As of 6 Aug 2017, the price is $3,270.
14 August 2017	$4,400	Price passed $3,000 for the first time on 5 August 2017, then $4,000 on 12 August 2017 and $4,400 two days later.
1 Sept2017	$5,013.91	Price broke $5,000 for the first time.
12 Sept 2017	$2,900	Price dipped in response to China's bitcoin ICO and exchange crackdown.
13 October 2017	$5,600	Price shot back up in the aftermath of China's crackdown.
21 October 2017	$6,180	Price hit another all-time high as the impending forks drew closer.
17-20 Nov 2017	$7,600-8,100	Briefly topped at $8004.59. This surge in bitcoin
15 December 2017	$17,900	Price reached $17,900.
17 December 2017	$19,783.06	Price rose 5% in 24h, with its value being up 1,824% since 1 Jan 2017, to reach a new all-time high.
22 December 2017	$13,800	Price lost one third of its value in 24 hours, dropping below $14,000.

Source: https://en.m.wikipedia.org/wiki/History_of_bitcoin