SPY daily over a 10-year period with the 50,3 Bollinger Band and showing selected internal metrics for a comparison of 2018 levels vs. prior history - http://c.stockcharts.com/c-sc/sc?s=SPY&p=D&yr=10&mn=6&dy=0&i=p7570339438c&a=581689599&r=1545761713279