The 2010 maternal mortality rate per 100,000 births for Guinea is 680. This is compared with 859.9 in 2008 and 964.7 in 1990. The under 5 mortality rate, per 1,000 births is 146 and the neonatal mortality as a percentage of under 5s mortality is 29. In Guinea the number of midwives per 1,000 live births is 1 and the lifetime risk of death for pregnant women is 1 in 26. Guinea has the second highest prevalence of female genital mutilation in the world.
Question: How many points lower is the maternal mortality rate in Guinea in 2010 compared with 1990?
Answer: 284.7