In simple terms, from Sept 2014 to Sept 2015, there were 30% new users who bought 1.5 million bitcoin, funded by 0.5 million of sellers and 1 million of mining.
From Sept 2015 to Sept 2016 there were 37% new users who bought 1.8 million bitcoin, funded by 1.0 million sellers and 900'000 of mining
From Sept 2016 to Sept 2017 there were 43% new users who bought 2.2 million bitcoin funded by 1.4 million sellers and 800'000 of mining.
From Sept 2017 to Sept 2018 we could see 43% new users looking to buy 6.6 million coins. Supply at present price won't match that - 1.4 million sellers and 600'000 of new mining. Therefore the price would have to rise.
However, with less than 0.25% of the adult population owning any bitcoin, the growth may be much more than 43%
Personally, I am looking at $98'630 next year. If you think it is not possible, I wrote two blogs explaining the maths. The short version is here:
https://steemit.com/bitcoin/@swissclive/bitcoin-next-year-s-supply-and-demand-equation-next-year-s-bitcoin-price-could-be-usd13-200-or-usd52-000-or-usd98-630
In simple terms, from Sept 2014 to Sept 2015, there were 30% new users who bought 1.5 million bitcoin, funded by 0.5 million of sellers and 1 million of mining.
From Sept 2015 to Sept 2016 there were 37% new users who bought 1.8 million bitcoin, funded by 1.0 million sellers and 900'000 of mining
From Sept 2016 to Sept 2017 there were 43% new users who bought 2.2 million bitcoin funded by 1.4 million sellers and 800'000 of mining.
From Sept 2017 to Sept 2018 we could see 43% new users looking to buy 6.6 million coins. Supply at present price won't match that - 1.4 million sellers and 600'000 of new mining. Therefore the price would have to rise.
However, with less than 0.25% of the adult population owning any bitcoin, the growth may be much more than 43%
Lol :D