In 2013 to 2014, Bitcoin crashed from $1000 to $200
From 2016 to March 2018 Bitcoin was:
$1,000 to $20,000
$20,000 to $6,500
$6500 to to $12,000
$12,000 to $7,500

Bitcoin is the most "feared investment" after going up from $1 to $10,000 in 9 years and big names saying bad things for Bitcoin and cryptos
Its normal for cryptocurrency to grow this far and sometimes dump its price in the market because there are a lot of people who are using bitcoins differently like trading in the market or they are selling their coins because of a fake news that makes the price of bitcoins to dump.