1957

8.1

1994

4.8

1964

7.2

1962

7.9

1946

7.6

2015

6.7

2001

5.8

1966

7.2

1990

6.5

1999

5.1

1997

6.2

1988

7.7

1985

5.5

2001

6.5

1968

7.3

1992

6.7

2004

6.6

1972

6.2

1982

6.8

1988

6.8