1666 before 2100

Bull Correction:
1753 = .38*'5'
1666 = 'iv' = .62*'5' = elliott double 4 = high probable
1510 = .38*'(3)'

Bear market:
1276 = 'B' = .62*'(3)'
1131 = '(1)' = .76*'(3)'