this is the movement from 2013 to 2018 which is obtained from the
https://coinmarketcap.com/currencies/bitcoin/ data from this picture what information can you get? with data from bitcoin price movements that have a span of one year I hope it can help you to be able to provide predictions for the price of bitcoin that will occur this year and in the next few years.
Bitcoin price movements with a span of 1 year (2013-2014)

Bitcoin price movements with a span of 1 year (2014-2015)

Bitcoin price movements with a span of 1 year (2016-2017)

Bitcoin price movements with a span of 1 year (2017-2018)

from this data shows that not always the price of bitcoin can be high, there must be a year that makes the price of bitcoin collapse and this year the price movements are almost the same as in 2014-2015 (prices tend to fall).
It does not depend upon the history prices but if we see and observe it from the other angle then it shows average increase with the passage of time it is increasing on average bases which is a green sign. This graphing is not serious about Bitcoin as we see that it is not time dependant but only demand rate dependant and several other market factors, currently we are observing increase which is showing us a better market future and I hope so we see it in the upcoming few months.