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1970 =5000
1980-1983 = 11,000 - 13,000
1983-1984 = 13,001 - 15,000
1985-1986 = 17,000 - 20,000
1988-1989 = 22,000 - 25,000
1989-1991 = 26,000 - 33,000
1992-???? = 35,000- ????