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
The year we had was quite amazing but I fear it could be an outlier, although I like many would probably be happy if we can even have a year similar to that of 2012 or 2016 with around a 100% growth in bitcoin price.
We hope to still have many great years in the future, but I dont think many years with over 1000% returns are possible. Even if we reached McAfees latest prediction, that could be achieved in a couple of years with those returns. So, I think it is more likely well get two or three-digit percentage increases at most.