1986

8.3

1999

6.8

1998

7.0

1989

8.0

1989

8.3

2007

7.9

2011

7.4

2009

7.9

2009

7.6

2021

6.5

1964

7.4

1971

7.8

1988

5.6

1962

6.9

1974

5.8

1985

6.8

1975

7.3

1985

4.8

1972

7.4

2003

9.1