2017 was 4th best year for Bitcoin after 2010, 2013 and 2011. You see all beside year 2014 were positive.
2010 $0.003 +10000%
2011 $0.3 +1566%
2012 $5 +160%
2013 $13 +5823%
2014 $770 -59%
2015 $316 +36%
2016 $430 +128%
2017 $980 +1286%
2018 $13585
I agree that 2017 was the 4th best year for Bitcoin as it is the year of the dawn of massive adoption of cryptos. It is the year that proved Bitcoin has real worth and is not just a Ponzi scheme although in the process some people still call it a bubble. At least it was legalized by some countries. I hope 2018 would be another year of Bitcoin development and rise. I hope it won't go to a bearish trend this year.
Even if 2018 will be bearish. What then? History teach us that even after rare bearish years there are many strong bull run years. I dont expect any year with +1000% Bitcoin growth anymore. But that will also eliminate possible future bearish years also