20% won't come easy, but the growth should be exponential.
So even though 20% is still far, 40% will come much much faster afterwards.
1% can make a scene for some people and even the media, maybe when users and people who understand cryptocurrency are at the 10%-15% point, to touch the 20%-60% figure is an easy thing.
The way it works is like a virus, which is easily spread when many people come into contact with infected people. The more people who are infected by the science of Bitcoin and start talking, the more opportunities for cryptocurrency growth will be recognized by the public.