As of the census of 2000, there were 6,299 people, 2,519 households, and 1,592 families residing in the city. The population density was 914.5 persons per square mile (353.0/km²). There were 2,702 housing units at an average density of 392.3 per square mile (151.4/km²). The racial makeup of the city was 75.33% White (U.S. Census), 22.38% African American (U.S. Census) or Race (United States Census), 0.24% Native American (U.S. Census), 0.57% Asian (U.S. Census), 0.08% Pacific Islander (U.S. Census), 0.24% from Race (United States Census), and 1.16% from two or more races. Hispanic (U.S. Census) or Latino (U.S. Census) of any race were 0.89% of the population.

How many more people are there than housing units?
A: 3597

The overall literacy rate for those aged 10 and over was 95.7% but amongst those living in the estate sector it was only 86.1%. Of the 18,615,577 aged 5 or over, 499,563 (2.7%) had received a higher education qualification, 2,293,841 (12.3%) had passed GCE Advanced Level in Sri Lanka, 3,159,402 (17.0%) had passed GCE Ordinary Level in Sri Lanka and 700,419 (3.8%) had no formal schooling. The remaining 11,962,352 (64.3%) had left school with no qualifications or were currently at school.

How many less people had passed GCE Advanced Level in Sri Lanka than those who had passed GCE Ordinary Level?
A: 865561

Graduation rates among district-run schools, meanwhile, steadily increased in the ten years from 2005. In 2005, Philadelphia had a district graduation rate of 52%. This number increased to 65% in 2014, still below the national and state averages. Scores on the states standardized test, the Pennsylvania System of School Assessment (PSSA) trended upward from 2005 to 2011 but subsequently decreased. In 2005, the district-run schools scored an average of 37.4% on math and 35.5% on reading. The citys schools reached its peak scores in 2011 with 59.0% on math and 52.3% on reading. In 2014, the scores dropped significantly to 45.2% on math and 42.0% on reading.

How many years trended upward on the states standardized test (PSSA)
A:
6