Table:
text: Demographics of North Korea
Vital statistics
Vital statistics
Period Births Deaths Difference Crude_Birth_Rate Crude_Death_Rate Natural_Increase Total_Fertility_Rate Infant_Mortality_Rate
1985 - 1990 389 000 105 000 284 000 200 54 146 245 261
1990 - 1995 450 000 124 000 326 000 215 59 155 240 243
1995 - 2000 443 000 219 000 225 000 198 98 101 220 549
2000 - 2005 379 000 209 000 170 000 163 90 73 205 285

Question: What is the minimum infant mortality rate considering North Korea's demographics for the period 1985-1990?