2018 is the year of maturity or adulthood.
The 2000 years is just a number of the years that have passed by. It denotes the passing of time, of events and of people.
The 18 years shows how well we’ve grown or how far we’ve come as a world in the second millennium. It denotes we will be or are now gaining independence, independence from states, from colonial parents, from (money?), from debts rising, from… It includes the independence and security that doctors and scientists enjoy, and more to come are government bodies and agencies. There is hope for next year, as we will see more maturity in how state and international matters are dealt with.