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Table 12 Distribution of US schools amoung different periods of construction

From: Forest carbon in North America: annual storage and emissions from British Columbia’s harvest, 1965–2065

Period of construction Age class Proportion of schools surveyed (%)
1901-1920 80 3
1921-1930 70 7
1931-1940 60 5
1941-1950 50 6
1951-1960 40 26
1961-1970 30 24
1971-1980 20 13
1981-1990 10 8
1991-2000 0 9
  1. Data were from Lewis and others [76].