Bar chart with 6 items.Item 1, 1970-1974 1.38% Item 2, 1975-1979 7.19% Item 3, 1980-1984 7.93% Item 4, 1985-1989 10.11% Item 5, 1990-1994 21.6% Item 6, 1995-1999 51.79%
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