Observations from the past could repeat in future
Major double tops around 1534 (2000) 1576 (2007) could became major support
Relative lost 50% (2003) (took 944 days) and 57% (2009) (took 548 days)
-> if we figured possible 50% drop from 2137 it would gives around 1073.9 which was a support (could be within 1000 days) (2018)
Looking incredible? We never knows