1977 332.8 333.1 334.0 335.7 336.5 336.0 334.7 332.3 331.0 331.4 332.0 333.6 333.6
1978 335.3 335.8 336.8 337.8 338.0 337.5 336.0 333.9 332.3 332.3 333.2 334.5 335.3
1979 336.0 337.0 338.4 339.0 338.9 339.0 337.6 335.4 333.9 334.0 335.1 336.4 336.7
1980 338.1 339.7 341.3 342.4 342.2 341.0 339.0 337.0 336.2 336.1 337.1 338.7 339.1
1981 340.0 341.4 342.3 343.2 343.4 342.0 340.3 338.6 337.2 337.4 338.9 340.0 340.4
1982 340.9 342.0 343.1 343.8 343.8 342.9 341.5 339.0 337.3 337.5 339.0 340.4 340.9
1983 341.7 342.2 342.9 344.9 345.8 345.8 343.3 341.0 339.6 339.7 340.9 342.5 342.5
1984 343.8 344.4 345.4 346.8 347.3 346.6 344.9 342.7 341.2 341.6 342.7 343.8 344.3
1985 344.5 345.4 346.7 347.8 348.4 348.0 346.0 343.9 342.7 342.7 343.8 345.2 345.4
1986 346.0 346.4 347.6 349.2 349.8 348.9 346.8 345.1 343.8 343.6 345.2 346.7 346.6
1987 347.3 348.0 349.1 350.6 351.6 351.1 349.4 347.3 346.3 346.5 347.9 349.3 348.7
1988 350.1 351.3 352.3 353.4 354.1 353.6 352.2 350.1 348.6 349.0 350.0 351.3 351.3
1989 352.5 353.0 353.8 355.2 355.9 355.3 353.6 351.0 349.3 349.7 351.3 352.5 352.8
1990 353.7 354.8 355.6 356.5 356.9 356.2 354.1 352.0 351.0 351.2 352.7 354.5 354.1
1991 355.0 355.8 357.3 358.5 359.2 358.2 355.8 353.7 352.1 352.3 353.6 355.2 355.6
1992 356.4 357.0 357.9 359.0 359.7 359.1 356.7 354.8 353.4 353.2 354.3 355.7 356.4