Keep above value if difference below threshold

[MagnusPetersson]

I want Power Query to generate the output column based on the input column and a threshold constant (=0.9 in below example). The first output value is the first input value and then output value is either the above output value, if input is a higher value than the above output value multiplied with the threshold constant (0.9), or the corresponding input value. 

Input	Output
2.00	2.00
1.98	2.00
1.96	2.00
1.94	2.00
1.92	2.00
1.90	2.00
1.88	2.00
1.86	2.00
1.85	2.00
1.83	2.00
1.81	2.00
1.79	1.79
1.77	1.79
1.76	1.79
1.74	1.79
1.72	1.79
1.70	1.79
1.69	1.79
1.67	1.79
1.65	1.79
1.64	1.79
1.62	1.79
1.60	1.60
1.59	1.60

[wdx223_Daniel · Accepted solution]

= #table({"Input","Output"},List.Accumulate(PreviousStepName[Input],{},(x,y)=>if x={} then {{{y,y}},y} else if y<=x{1}*0.9 then {x{0}&{{y,y}},y} else {x{0}&{{y,x{1}}},x{1}}){0})