population (millions)
1000-1800
lower
estimate
upper
estimate
1000 254 345
1100 301 320
1200 360 450
1250 400 416
1300 360 432
1340 443
1400 350 374
1500 425 540
1600 545 579
1650 470 545
1700 600 679
1750 629 961
1800 813 1125
 growth factor
1000-1800
       3.20       3.26  
average compound
annual rate of growth
0.146% 0.148%
years to double         477              469  
double             2                 2