import graph3; 

size3(150,IgnoreAspect);
size(8cm,0);

limits((50,2005,2),(400,2009,5)); 
triple m=currentpicture.userMin(); 
triple M=currentpicture.userMax(); 
triple target=0.5*(m+M); 
currentprojection=perspective(camera=target+realmult(dir(60,50),M-m), 
                              target=target);

xaxis3(Bounds(),OutTicks(Step=100,step=50,endlabel=false),p=blue); 
yaxis3(Bounds(),OutTicks(Step=1),p=red); 
zaxis3(Bounds(),OutTicks(Step=1,step=.5),p=.8green);