Colorize individual lines in gannt like plot

[Ullsokk]

I want my gannt chart lines to have a color corresponding to the amount variable, akin to microsoft excel's conditional formatting. I want higher values to be red, average to be yellow and low values to be green, preferrably with gradings in between. Is there a way to colorize each line automatically based on the amount value? My real data contains hundreds of cases, so I dont want a hardcoded sollution.   

Here is my code:

DATA have;
 INPUT id $ amount start_dt end_dt ;
CARDS;
1 5000 21000 21030
2 30000 20870 20999
3 200 20951 21000
4 10000 20942 20987
5 500 20820 20900
;

RUN; 

data have ;
set have ;
format start_dt end_dt date9.;
run;

ods graphics on ;

proc sgplot data=have noautolegend;
highlow y=id low=start_dt high=end_dt/
         lineattrs=(thickness=6pt);
yaxis grid reverse ; 
run;

[PeterClemmensen · Accepted solution]

Something like this?

proc sgplot data=have noautolegend;
    highlow y=id low=start_dt high=end_dt/
        lineattrs=(thickness=6pt) colorresponse=Amount colormodel=(green gold red);
    gradlegend / position=right;
    yaxis grid reverse; 
run;

Result: