Data series 1, One million + (Line).
Point 1, 1976, Y=20.9.
Point 2, 1977, Y=24.1.
Point 3, 1978, Y=25.4.
Point 4, 1979, Y=28.8.
Point 5, 1980, Y=30.9.
Point 6, 1981, Y=28.2.
Point 7, 1982, Y=26.5.
Point 8, 1983, Y=27.
Point 9, 1984, Y=25.5.
Point 10, 1985, Y=24.8.
Point 11, 1986, Y=24.1.
Point 12, 1987, Y=22.9.
Point 13, 1988, Y=28.2.
Point 14, 1989, Y=28.8.
Point 15, 1990, Y=31.9.
Point 16, 1991, Y=35.5.
Point 17, 1992, Y=31.1.
Point 18, 1993, Y=29.9.
Point 19, 1994, Y=26.3.
Point 20, 1995, Y=22.3.
Point 21, 1996, Y=21.6.
Point 22, 1997, Y=19.3.
Point 23, 1998, Y=16.2.
Point 24, 1999, Y=15.5.
Point 25, 2000, Y=14.8.
Point 26, 2001, Y=15.1.
Point 27, 2002, Y=14.2.
Point 28, 2003, Y=14.4.
Point 29, 2004, Y=13.2.
Point 30, 2005, Y=13.
Maximum Y=35.5 for 1991 and minimum Y=13 for 2005.
Data series 2, 500,000-999,000 (Line).
Point 1, 1976, Y=19.5.
Point 2, 1977, Y=18.1.
Point 3, 1978, Y=19.4.
Point 4, 1979, Y=21.7.
Point 5, 1980, Y=21.3.
Point 6, 1981, Y=22.2.
Point 7, 1982, Y=19.4.
Point 8, 1983, Y=17.2.
Point 9, 1984, Y=18.5.
Point 10, 1985, Y=17.9.
Point 11, 1986, Y=18.4.
Point 12, 1987, Y=20.1.
Point 13, 1988, Y=20.3.
Point 14, 1989, Y=23.8.
Point 15, 1990, Y=24.6.
Point 16, 1991, Y=24.1.
Point 17, 1992, Y=22.9.
Point 18, 1993, Y=22.5.
Point 19, 1994, Y=19.7.
Point 20, 1995, Y=21.1.
Point 21, 1996, Y=15.7.
Point 22, 1997, Y=18.1.
Point 23, 1998, Y=17.8.
Point 24, 1999, Y=16.6.
Point 25, 2000, Y=15.
Point 26, 2001, Y=14.6.
Point 27, 2002, Y=14.2.
Point 28, 2003, Y=14.1.
Point 29, 2004, Y=14.1.
Point 30, 2005, Y=14.8.
Maximum Y=24.6 for 1990 and minimum Y=14.1 for 2003.
Data series 3, 250,000-499,000 (Line).
Point 1, 1976, Y=16.5.
Point 2, 1977, Y=16.4.
Point 3, 1978, Y=16.7.
Point 4, 1979, Y=18.6.
Point 5, 1980, Y=22.1.
Point 6, 1981, Y=22.
Point 7, 1982, Y=19.1.
Point 8, 1983, Y=16.3.
Point 9, 1984, Y=16.1.
Point 10, 1985, Y=17.2.
Point 11, 1986, Y=19.8.
Point 12, 1987, Y=16.3.
Point 13, 1988, Y=17.7.
Point 14, 1989, Y=18.3.
Point 15, 1990, Y=21.7.
Point 16, 1991, Y=22.4.
Point 17, 1992, Y=20.1.
Point 18, 1993, Y=25.1.
Point 19, 1994, Y=24.
Point 20, 1995, Y=24.3.
Point 21, 1996, Y=21.1.
Point 22, 1997, Y=19.1.
Point 23, 1998, Y=16.6.
Point 24, 1999, Y=15.3.
Point 25, 2000, Y=14.1.
Point 26, 2001, Y=15.2.
Point 27, 2002, Y=15.6.
Point 28, 2003, Y=15.6.
Point 29, 2004, Y=15.
Point 30, 2005, Y=15.2.
Maximum Y=25.1 for 1993 and minimum Y=14.1 for 2000.
Data series 4, 100,000-249,000 (Line).
Point 1, 1976, Y=11.3.
Point 2, 1977, Y=11.6.
Point 3, 1978, Y=11.
Point 4, 1979, Y=12.
Point 5, 1980, Y=13.
Point 6, 1981, Y=14.3.
Point 7, 1982, Y=12.8.
Point 8, 1983, Y=10.7.
Point 9, 1984, Y=11.7.
Point 10, 1985, Y=11.4.
Point 11, 1986, Y=12.7.
Point 12, 1987, Y=11.7.
Point 13, 1988, Y=12.7.
Point 14, 1989, Y=13.2.
Point 15, 1990, Y=14.1.
Point 16, 1991, Y=14.9.
Point 17, 1992, Y=13.2.
Point 18, 1993, Y=14.6.
Point 19, 1994, Y=15.
Point 20, 1995, Y=13.2.
Point 21, 1996, Y=11.9.
Point 22, 1997, Y=12.
Point 23, 1998, Y=11.2.
Point 24, 1999, Y=9.5.
Point 25, 2000, Y=9.6.
Point 26, 2001, Y=9.7.
Point 27, 2002, Y=9.2.
Point 28, 2003, Y=9.8.
Point 29, 2004, Y=9.2.
Point 30, 2005, Y=10.1.
Maximum Y=15 for 1994 and minimum Y=9.2 for 2002.